def __init__(self, indices, summand, domain, conditions=tuple()):
r'''
Sum summand over indices over domains.
Arguments serve analogous roles to Forall arguments (found in basiclogic/booleans):
indices: instance vars
summand: instanceExpressions
domains: conditions (except no longer optional)
'''
OperationOverInstances.__init__(self,
Sum._operator_,
indices,
summand,
domain=domain,
conditions=conditions)
if len(self.instanceVars) != 1:
raise ValueError('Only one index allowed per integral!')
self.indices = self.instanceVars
self.summand = self.instanceExpr
self.index = self.instanceVars[0]
if isinstance(self.domain, RealInterval):
raise ValueError(
'Sum cannot sum over non-discrete set (e.g. Interval)')
elif self.domain == Reals:
raise ValueError('Sum cannot sum over Reals.')
elif self.domain == Integers:
self.domain = Interval(Neg(infinity), infinity)
elif self.domain == Naturals:
self.domain = Interval(zero, infinity)
def __init__(self,
instanceVarOrVars,
instanceElement,
domain=None,
domains=None,
conditions=tuple()):
'''
Create an expression representing the set of all instanceElement for instanceVar(s) such that the conditions are satisfied:
{instanceElement | conditions}_{instanceVar(s) \in S}
'''
# nestMultiIvars=False will ensure it does NOT treat multiple instance variables as
# nested SetOfAll operations -- that would not make sense.
# (unlike forall, exists, summation, and product where it does make sense).
OperationOverInstances.__init__(self,
SetOfAll._operator_,
instanceVarOrVars,
instanceElement,
domain=domain,
conditions=conditions,
nestMultiIvars=False)
self.instanceElement = self.instanceExpr
if hasattr(self, 'instanceVar'):
if not hasattr(self, 'domain'):
raise ValueError("SetOfAll requires a domain")
elif hasattr(self, 'instanceVars'):
if not hasattr(self, 'domains') or None in self.domains:
raise ValueError("SetOfAll requires a domain(s)")
else:
assert False, "Expecting either 'instanceVar' or 'instanceVars' to be set"
def __init__(self, instanceVar, instanceElement, domain, conditions=tuple()):
'''
Create an expression representing the set of all instanceElement for instanceVars such that the conditions are satisfied:
{instanceElement | conditions}_{instanceVar \in S}
'''
OperationOverInstances.__init__(self, SetOfAll._operator_, instanceVar, instanceElement, domain=domain, conditions=conditions)
self.instanceElement = self.instanceExpr
def __init__(self,
indexOrIndices,
summand,
domain=None,
domains=None,
conditions=tuple(),
_lambda_map=None):
r'''
Sum summand over indices over domains.
Arguments serve analogous roles to Forall arguments (found in basiclogic/booleans):
indices: instance vars
summand: instanceExpressions
domains: conditions (except no longer optional)
'''
# nestMultiIvars=True will cause it to treat multiple instance variables as nested Sum operations internally
# and only join them together as a style consequence.
OperationOverInstances.__init__(self,
Sum._operator_,
indexOrIndices,
summand,
domain=domain,
domains=domains,
conditions=conditions,
nestMultiIvars=True,
_lambda_map=_lambda_map)
if hasattr(self, 'instanceVar'):
self.index = self.instanceVar
if hasattr(self, 'instanceVars'):
self.indices = self.instanceVars
self.summand = self.instanceExpr
"""
def __init__(self,
instance_param_or_params,
instance_element,
domain=None,
*,
domains=None,
condition=None,
conditions=None,
_lambda_map=None):
'''
Create an expression representing the set of all
instance_element for instance parameter(s) such that the conditions
are satisfied:
{instance_element | conditions}_{instance_param_or_params \in S}
'''
OperationOverInstances.__init__(self,
SetOfAll._operator_,
instance_param_or_params,
instance_element,
domain=domain,
domains=domains,
condition=condition,
conditions=conditions,
_lambda_map=_lambda_map)
self.instance_element = self.instance_expr
if hasattr(self, 'instance_param'):
if not hasattr(self, 'domain'):
raise ValueError("SetOfAll requires a domain")
elif hasattr(self, 'instance_params'):
if not hasattr(self, 'domains') or None in self.domains:
raise ValueError("SetOfAll requires domains")
else:
assert False, (
"Expecting either 'instance_param' or 'instance_params' "
"to be set")
def __init__(self,
instanceParamOrParams,
instanceExpr,
*,
domain=None,
domains=None,
condition=None,
conditions=None,
_lambda_map=None):
'''
Create a exists (there exists) expression:
exists_{instanceParamOrParams | conditions} instanceExpr
This expresses that there exists a value of the instance parameters(s)
for which the optional condition(s) is/are satisfied and the
instanceExpr is true. The instance parameters(s) and condition(s) may
be singular or plural (iterable).
'''
OperationOverInstances.__init__(self,
NotExists._operator_,
instanceParamOrParams,
instanceExpr,
domain=domain,
domains=domains,
condition=condition,
conditions=conditions,
_lambda_map=_lambda_map)
def __init__(self,
instanceParamOrParams,
instanceExpr,
*,
domain=None,
domains=None,
condition=None,
conditions=None,
_lambda_map=None):
'''
Create a Forall expression:
forall_{instanceParamOrParams | conditions} instanceExpr.
This expresses that the instanceExpr is true for all values of the
instance parameter(s) given that the optional condition(s) is/are
satisfied. The instance parameter(s) and condition(s)
may be singular or plural (iterable).
'''
OperationOverInstances.__init__(self,
Forall._operator_,
instanceParamOrParams,
instanceExpr,
domain=domain,
domains=domains,
condition=condition,
conditions=conditions,
_lambda_map=_lambda_map)
def __init__(self,
indexOrIndices,
summand,
*,
domain=None,
domains=None,
condition=None,
conditions=None,
_lambda_map=None):
r'''
Sum summand over indices over domains.
Arguments serve analogous roles to Forall arguments (found in basiclogic/booleans):
indices: instance vars
summand: instanceExpressions
domains: conditions (except no longer optional)
'''
OperationOverInstances.__init__(self,
Sum._operator_,
indexOrIndices,
summand,
domain=domain,
domains=domains,
condition=condition,
conditions=conditions,
_lambda_map=_lambda_map)
if hasattr(self, 'instanceVar'):
self.index = self.instanceVar
if hasattr(self, 'instanceVars'):
self.indices = self.instanceVars
self.summand = self.instanceExpr
"""
def __init__(self,
instanceVarOrVars,
instanceExpr,
domain=None,
domains=None,
conditions=tuple(),
_lambda_map=None):
'''
Create a exists (there exists) expression:
exists_{instanceVars | conditions} instanceExpr
This expresses that there exists a value of the instanceVar(s) for
which the optional condition(s) is/are satisfied and the instanceExpr
is true. The instanceVar(s) and condition(s) may be
singular or plural (iterable).
'''
# nestMultiIvars=True will cause it to treat multiple instance
# variables as nested NotExists operations internally
# and only join them together as a style consequence.
OperationOverInstances.__init__(self,
NotExists._operator_,
instanceVarOrVars,
instanceExpr,
domain,
domains,
conditions,
nestMultiIvars=True,
_lambda_map=_lambda_map)
def __init__(self,
index,
integrand,
domain,
*,
condition=None,
conditions=None):
r'''
Integrates integrand over indices over domain.
Arguments serve analogous roles to Forall arguments (found in basiclogic/booleans):
index: single instance var
integrand: instanceExpressions
domains: conditions (except no longer optional)
'''
OperationOverInstances.__init__(self,
Integrate._operator_,
index,
integrand,
domain=domain,
condition=condition,
conditions=conditions)
if len(self.instanceVars) != 1:
raise ValueError('Only one index allowed per integral!')
elif isinstance(self.domain, Interval):
raise ValueError('Can\'t integrate over DiscreteContiguousSet!')
elif self.domain == Reals:
self.domain = IntervalCC(Neg(infinity), infinity)
self.index = self.instanceVars[0]
self.integrand = self.instanceExpr
def __init__(self, instanceVarOrVars, instanceExpr, domain=None, domains=None, conditions = tuple()):
'''
Create a Forall expression:
forall_{instanceVars | conditions} instanceExpr.
This expresses that the instanceExpr is true for all values of the instanceVar(s)
given that the optional condition(s) is/are satisfied. The instanceVar(s) and condition(s)
may be singular or plural (iterable).
'''
OperationOverInstances.__init__(self, Forall._operator_, instanceVarOrVars, instanceExpr, domain, domains, conditions)
def __init__(self, indices, summand, domain, conditions=tuple()):
r'''
Sum summand over indices over domains.
Arguments serve analogous roles to Forall arguments (found in basiclogic/booleans):
indices: instance vars
summand: instanceExpressions
domains: conditions (except no longer optional)
'''
OperationOverInstances.__init__(self,
Prod._operator_,
indices,
summand,
domain=domain,
conditions=conditions)
def __init__(self, instanceVarOrVars, instanceExpr, domain=None, domains=None,
conditions = tuple(), _lambda_map=None):
'''
Create a Forall expression:
forall_{instanceVars | conditions} instanceExpr.
This expresses that the instanceExpr is true for all values of the instanceVar(s)
given that the optional condition(s) is/are satisfied. The instanceVar(s) and condition(s)
may be singular or plural (iterable).
'''
# nestMultiIvars=True will cause it to treat multiple instance
# variables as nested Forall operations internally
# and only join them together as a style consequence.
OperationOverInstances.__init__(self, Forall._operator_, instanceVarOrVars,
instanceExpr, domain, domains, conditions,
nestMultiIvars=True, _lambda_map=_lambda_map)
def _formatted(self, format_type, **kwargs):
from proveit.numbers import Interval
# MUST BE UPDATED TO DEAL WITH 'joining' NESTED LEVELS
fence = kwargs['fence'] if 'fence' in kwargs else False
if isinstance(self.domain, Interval):
lower = self.domain.lower_bound.formatted(format_type)
upper = self.domain.upper_bound.formatted(format_type)
formatted_inner = self.operator.formatted(
format_type) + r'_{' + self.index.formatted(
format_type) + '=' + lower + r'}' + r'^{' + upper + r'} '
explicit_ivars = list(self.explicit_instance_vars())
has_explicit_ivars = (len(explicit_ivars) > 0)
explicit_conds = list(self.explicit_conditions())
has_explicit_conds = (len(explicit_conds) > 0)
if has_explicit_conds:
if has_explicit_ivars:
formatted_inner += " | "
formatted_inner += ', '.join(
condition.formatted(format_type)
for condition in explicit_conds)
formatted_inner += self.summand.formatted(format_type, fence=True)
return maybe_fenced(format_type, formatted_inner, fence=fence)
else:
return OperationOverInstances._formatted(self,
format_type,
fence=fence)
def __init__(self,
instanceVarOrVars,
instanceExpr,
domain=None,
domains=None,
conditions=tuple()):
'''
Create a exists (there exists) expression:
exists_{instanceVars | condition} instanceExpr
This expresses that there exists a value of the instanceVar(s) for which the optional condition(s)
is/are satisfied and the instanceExpr is true. The instanceVar(s) and condition(s) may be
singular or plural (iterable).
'''
OperationOverInstances.__init__(self, Exists._operator_,
instanceVarOrVars, instanceExpr,
domain, domains, conditions)
def shallow_simplification(self,
*,
must_evaluate=False,
**defaults_config):
'''
From this forall statement, evaluate it to TRUE or FALSE if
possible by calling the domain's forall_evaluation method
'''
from proveit.logic import EvaluationError
if must_evaluate and not self.has_domain():
# Cannot automatically evaluate a forall statement with
# no domain.
raise EvaluationError(self)
if hasattr(self, 'instance_param'):
if hasattr(self.domain, 'forall_evaluation'):
# Use the domain's forall_evaluation method
return self.domain.forall_evaluation(self)
'''
# Let's not do this fancy stuff just yet.
# Evaluate an unbundled version
unbundle_eq = self.unbundle_equality()
return unbundle_eq.rhs.evaluation()
'''
if must_evaluate:
raise EvaluationError(self)
return OperationOverInstances.shallow_simplification(self)
def __init__(self, indices, summand, domain, conditions=tuple()):
r'''
Sum summand over indices over domains.
Arguments serve analogous roles to Forall arguments (found in basiclogic/booleans):
indices: instance vars
summand: instanceExpressions
domains: conditions (except no longer optional)
'''
# nestMultiIvars=True will cause it to treat multiple instance variables as nested Prod operations internally
# and only join them together as a style consequence.
OperationOverInstances.__init__(self,
Prod._operator_,
indices,
summand,
domain=domain,
conditions=conditions,
nestMultiIvars=True)
def extractInitArgValue(argName, operators, operands):
'''
Given a name of one of the arguments of the __init__ method,
return the corresponding value contained in the 'operands'
composite expression (i.e., the operands of a constructed operation).
'''
if argName == 'indexOrIndices':
argName = 'instanceVarOrVars'
elif argName == 'summand':
argName = 'instanceExpr'
return OperationOverInstances.extractInitArgValue(
argName, operators, operands)
def __init__(self,
index_or_indices,
summand,
*,
domain=None,
domains=None,
condition=None,
conditions=None,
styles=None,
_lambda_map=None):
r'''
Sum summand over indices over domains.
Arguments serve analogous roles to Forall arguments (found in
basiclogic.booleanss):
indices: instance vars
summand: instance_expressions
domains: conditions (except no longer optional)
'''
if (domains is not None):
raise NotImplementedError("Sum class not yet implemented for "
"multiple domains nor for multiple "
"indices.")
OperationOverInstances.__init__(self,
Sum._operator_,
index_or_indices,
summand,
domain=domain,
domains=domains,
condition=condition,
conditions=conditions,
styles=styles,
_lambda_map=_lambda_map)
if hasattr(self, 'instance_param'):
self.index = self.instance_param
if hasattr(self, 'instance_params'):
self.indices = self.instance_params
self.summand = self.instance_expr
"""
def _formatted(self, format_type, **kwargs):
# MUST BE UPDATED TO DEAL WITH 'joining' NESTED LEVELS
fence = kwargs['fence'] if 'fence' in kwargs else False
explicit_conds = self.explicit_conditions()
if isinstance(self.domain, Interval) and len(explicit_conds) == 0:
formatted_operator = self.operator.formatted(format_type)
formatted_index = self.index.formatted(format_type)
formatted_lower = self.domain.lower_bound.formatted(format_type)
formatted_upper = self.domain.upper_bound.formatted(format_type)
formatted_summand = self.summand.formatted(format_type, fence=True)
formatted_inner = "%s_{%s = %s}^{%s} %s" % (
formatted_operator, formatted_index, formatted_lower,
formatted_upper, formatted_summand)
return maybe_fenced(format_type, formatted_inner, fence=fence)
else:
return OperationOverInstances._formatted(self,
format_type,
fence=fence)
def _formatted(self, formatType, **kwargs):
# MUST BE UPDATED TO DEAL WITH 'joining' NESTED LEVELS
fence = kwargs['fence'] if 'fence' in kwargs else False
if isinstance(self.domain,Interval):
lower = self.domain.lowerBound.formatted(formatType)
upper = self.domain.upperBound.formatted(formatType)
formattedInner = self.operator.formatted(formatType)+r'_{'+self.index.formatted(formatType)+'='+lower+r'}'+r'^{'+upper+r'} '
explicitIvars = list(self.explicitInstanceVars())
hasExplicitIvars = (len(explicitIvars) > 0)
explicitConds = list(self.explicitConditions())
hasExplicitConds = (len(explicitConds) > 0)
if hasExplicitConds:
if hasExplicitIvars:
formattedInner += " | "
formattedInner += ', '.join(condition.formatted(formatType) for condition in explicitConds)
formattedInner += self.summand.formatted(formatType, fence=fence)
return maybeFenced(formatType, formattedInner, fence=fence)
else:
return OperationOverInstances._formatted(self, formatType, fence)
def _formatted(self, format_type, **kwargs):
# ACTUALLY, notice that the open-interval versions
# probably lead to incorrect upper/lower bounds on the
# formatted integrals. For example, an integral over the
# open half-open interval (0, 1] would need to be formatted
# or expressed as a limit as 'a' approaches 0 from the right
# of the integral from 0 to 1.
fence = kwargs['fence'] if 'fence' in kwargs else False
if (isinstance(self.domain,IntervalCC) or
isinstance(self.domain,IntervalCO) or
isinstance(self.domain,IntervalOC) or
isinstance(self.domain,IntervalOO)):
lower = self.domain.lower_bound.formatted(format_type)
upper = self.domain.upper_bound.formatted(format_type)
formatted_inner = (
self.operator.formatted(format_type) +
r'_{' + lower + r'}' + r'^{' + upper + r'} ')
explicit_ivars = list(self.explicit_instance_vars())
has_explicit_ivars = (len(explicit_ivars) > 0)
explicit_conds = list(self.explicit_conditions())
has_explicit_conds = (len(explicit_conds) > 0)
if has_explicit_conds:
if has_explicit_ivars:
formatted_inner += " | "
formatted_inner += ', '.join(condition.formatted(format_type)
for condition in explicit_conds)
formatted_inner += (
self.integrand.formatted(format_type, fence=fence) +
r'\,d' + self.index.formatted(format_type))
# old/previous
# return (self.operator.formatted(format_type) +
# r'_{' + lower + r'}' + r'^{' + upper + r'}' +
# self.integrand.formatted(format_type, fence=fence) +
# 'd' + self.index.formatted(format_type))
return maybe_fenced(format_type, formatted_inner, fence=fence)
else:
return OperationOverInstances._formatted(self, format_type,
fence=fence)
def extractInitArgValue(argName, operators, operands):
'''
Given a name of one of the arguments of the __init__ method,
return the corresponding value contained in the 'operands'
composite expression (i.e., the operands of a constructed operation).
'''
from proveit.logic import InSet
if argName=='instanceElement':
return operands.body # instance mapping
elif argName=='instanceVar':
return operands.parameter
elif argName=='domain':
# the first condition must be the domain condition
domainCondition = operands.conditions[0]
assert isinstance(domainCondition, InSet), "Expecting the first condition of a SetOfAll object to be the domain condition of type InSet"
assert domainCondition.element==operands.parameter, "Expecting the first condition of a SetOfAll object to be the domain condition with the proper element"
return domainCondition.domain
elif argName=='conditions':
return ExprList(*operands.conditions[1:]) # all except the domain condition
else:
return OperationOverInstances.extractInitArgValue(argName, operators, operands)
def _formatted(self, formatType, **kwargs):
fence = kwargs['fence'] if 'fence' in kwargs else False
if isinstance(self.domain, Interval):
lower = self.domain.lowerBound.formatted(formatType)
upper = self.domain.upperBound.formatted(formatType)
formattedInner = self.operator.formatted(
formatType) + r'_{' + self.index.formatted(
formatType) + '=' + lower + r'}' + r'^{' + upper + r'} '
implicitIvars = self.implicitInstanceVars(formatType)
hasExplicitIvars = (len(implicitIvars) < len(self.instanceVars))
implicitConditions = self.implicitConditions(formatType)
hasExplicitConditions = self.hasCondition() and (
len(implicitConditions) < len(self.conditions))
if hasExplicitConditions:
if hasExplicitIvars:
formattedInner += " | "
formattedInner += ', '.join(
condition.formatted(formatType)
for condition in self.conditions
if condition not in implicitConditions)
formattedInner += self.summand.formatted(formatType, fence=fence)
return maybeFenced(formatType, formattedInner, fence=fence)
else:
return OperationOverInstances._formatted(self, formatType, fence)
def substitute_instances(self, universality, **defaults_config):
'''
Derive from this Exists operation, Exists_{..x.. in S | ..Q(..x..)..} P(..x..),
one that substitutes instance expressions given some
universality = forall_{..x.. in S | P(..x..), ..Q(..x..)..} R(..x..).
or forall_{..x.. in S | ..Q(..x..)..} P(..x..) = R(..x..).
Either is allowed in the theory of the existential quantifier.
Derive and return the following type of existential operation assuming universality:
Exists_{..x.. in S | ..Q(..x..)..} R(..x..)
Works also when there is no domain S and/or no conditions ..Q...
'''
raise NotImplementedError("Need to test/update")
from . import existential_implication, no_domain_existential_implication
from proveit import Etcetera
from proveit.logic import Forall
from proveit._generic_ import InstanceSubstitutionException
if isinstance(universality, Judgment):
universality = universality.expr
if not isinstance(universality, Forall):
raise InstanceSubstitutionException(
"'universality' must be a forall expression", self,
universality)
if self.instance_expr in universality.conditions:
# map from the forall instance variables to self's instance
# variables
i_var_substitutions = {
forall_ivar: self_ivar
for forall_ivar, self_ivar in zip(universality.instance_vars,
self.instance_vars)
}
first_condition = universality.conditions[0].substituted(
i_var_substitutions)
if first_condition != self.instance_expr:
raise InstanceSubstitutionException(
"The first condition of the 'universality' must match the instance expression of the Exists operation having instances substituted",
self, universality)
if (universality.instance_vars.num_entries() !=
self.instance_vars.num_entries()):
raise InstanceSubstitutionException(
"'universality' must have the same number of variables as the Exists operation having instances substituted",
self, universality)
if universality.domain != self.domain:
raise InstanceSubstitutionException(
"'universality' must have the same domain as the Exists having instances substituted",
self, universality)
if ExpressionList(universality.conditions[1:]).substituted(
i_var_substitutions) != self.conditions:
raise InstanceSubstitutionException(
"'universality' must have the same conditions as the Exists operation having instances substituted, in addition to the Exists instance expression",
self, universality)
_x = universality.instance_vars,
_y = self.instance_params
_P = Lambda(_y, self.instance_expr)
_Q = Lambda(_y, self.condition)
_R = Lambda(
_y,
universality.instance_expr.substituted(i_var_substitutions))
_impl = existential_implication.instantiate({
P: _P,
Q: _Q,
R: _R,
S: self.domain,
x: _x,
y: _y,
z: _y
})
return _impl.derive_consequent().derive_consequent()
# Default to the OperationOverInstances version which works with
# universally quantified equalities.
return OperationOverInstances.substitute(self, universality)
def __init__(self, index_or_indices, integrand, *, domain=None,
domains=None, condition=None, conditions=None,
styles=None, _lambda_map=None):
r'''
Represents a definite integral of the integrand over the
index_or_indices over the domain, with arguments serving
roles analogous to those for Forall arguments (found in
logic.booleans.quantification.universality) and Sum arguments
(found in numbers.summation):
index_or_indices: a single instance var such as x
integrand : instance expression
domain : conditions
Despite the generality preserved for the arguments, such
Integrate objects are currently defined only for a single
index and over a single continuous interval domain defined
by a numerical set (such as Real, RealPos, etc.) or real
interval (using IntervalCC, IntervalCO, IntervalOC, or
IntervalOO objects).
'''
# original
# OperationOverInstances.__init__(
# self, Integrate._operator_, index, integrand,
# domain=domain, condition=condition, conditions=conditions,
# styles=styles)
# new 20220111
# If domain expressed as a special number set,
# re-express domain as a continuous interval before
# feeding as argument to OperationOverInstances.__init__().
# if domain == Real:
# domain = IntervalOO(Neg(infinity), infinity)
# elif domain == RealPos:
# domain = IntervalOO(zero, infinity)
# elif domain == RealNonNeg:
# domain = IntervalCO(zero, infinity)
# elif domain == RealNeg:
# domain = IntervalOO(Neg(infinity), zero)
# elif domain == RealNonPos:
# domain = IntervalOC(Neg(infinity), zero)
OperationOverInstances.__init__(
self, Integrate._operator_, index_or_indices, integrand,
domain=domain, domains=domains, condition=condition,
conditions=conditions, styles=styles, _lambda_map=_lambda_map)
# original
# if len(self.instance_vars) != 1:
# raise ValueError('Only one index allowed per integral!')
# elif isinstance(self.domain, Interval):
# raise ValueError('Can\'t integrate over DiscreteContiguousSet!')
# elif self.domain == Real:
# self.domain = IntervalCC(Neg(infinity), infinity)
# self.index = self.instance_vars[0]
# self.integrand = self.instance_expr
# new
if hasattr(self, 'instance_param'):
self.index = self.instance_param
if hasattr(self, 'instance_params'):
self.indices = self.instance_params
if len(self.instance_params.entries) != 1:
raise ValueError('Only one index allowed per integral!')
if isinstance(self.domain, Interval):
# elaborate this error message later
raise ValueError('Can\'t integrate over DiscreteContiguousSet!')
self.integrand = self.instance_expr
def substituteInstances(self, universality, assumptions=USE_DEFAULTS):
'''
Derive from this Exists operation, Exists_{..x.. in S | ..Q(..x..)..} P(..x..),
one that substitutes instance expressions given some
universality = forall_{..x.. in S | P(..x..), ..Q(..x..)..} R(..x..).
or forall_{..x.. in S | ..Q(..x..)..} P(..x..) = R(..x..).
Either is allowed in the context of the existential quantifier.
Derive and return the following type of existential operation assuming universality:
Exists_{..x.. in S | ..Q(..x..)..} R(..x..)
Works also when there is no domain S and/or no conditions ..Q...
'''
raise NotImplementedError("Need to update")
from ._theorems_ import existentialImplication, noDomainExistentialImplication
from proveit import Etcetera
from proveit.logic import Forall
from proveit._generic_ import InstanceSubstitutionException
from proveit._common_ import n, Qmulti, xMulti, yMulti, zMulti, S
if isinstance(universality, KnownTruth):
universality = universality.expr
if not isinstance(universality, Forall):
raise InstanceSubstitutionException(
"'universality' must be a forall expression", self,
universality)
if self.instanceExpr in universality.conditions:
# map from the forall instance variables to self's instance variables
iVarSubstitutions = {
forallIvar: selfIvar
for forallIvar, selfIvar in zip(universality.instanceVars,
self.instanceVars)
}
firstCondition = universality.conditions[0].substituted(
iVarSubstitutions)
if firstCondition != self.instanceExpr:
raise InstanceSubstitutionException(
"The first condition of the 'universality' must match the instance expression of the Exists operation having instances substituted",
self, universality)
if len(universality.instanceVars) != len(self.instanceVars):
raise InstanceSubstitutionException(
"'universality' must have the same number of variables as the Exists operation having instances substituted",
self, universality)
if universality.domain != self.domain:
raise InstanceSubstitutionException(
"'universality' must have the same domain as the Exists having instances substituted",
self, universality)
if ExpressionList(universality.conditions[1:]).substituted(
iVarSubstitutions) != self.conditions:
raise InstanceSubstitutionException(
"'universality' must have the same conditions as the Exists operation having instances substituted, in addition to the Exists instance expression",
self, universality)
P_op, P_op_sub = Operation(P, self.instanceVars), self.instanceExpr
Q_op, Q_op_sub = Operation(Qmulti,
self.instanceVars), self.conditions
R_op, R_op_sub = Operation(
R, self.instanceVars), universality.instanceExpr.substituted(
iVarSubstitutions)
if self.hasDomain():
return existentialImplication.specialize({S:self.domain, P_op:P_op_sub, Q_op:Q_op_sub, R_op:R_op_sub}, \
relabelMap={xMulti:universality.instanceVars, yMulti:self.instanceVars, zMulti:self.instanceVars}, assumptions=assumptions).deriveConsequent(assumptions).deriveConsequent(assumptions)
else:
return noDomainExistentialImplication.specialize(
{
P_op: P_op_sub,
Q_op: Q_op_sub,
R_op: R_op_sub
},
relabelMap={
xMulti: universality.instanceVars,
yMulti: self.instanceVars,
zMulti: self.instanceVars
},
assumptions=assumptions).deriveConsequent(
assumptions).deriveConsequent(assumptions)
# Default to the OperationOverInstances version which works with universally quantified equivalences.
return OperationOverInstances.substitute(self,
universality,
assumptions=assumptions)
