def _attempt_proof_n_all(
self, current, context, agenda, accessible_vars, atoms, debug
):
agenda[Categories.EXISTS].add(
(ExistsExpression(current.term.variable, -current.term.term), context)
)
return self._attempt_proof(agenda, accessible_vars, atoms, debug + 1)
class Constants(object):
ALL = 'ALL'
EXISTS = 'EXISTS'
NOT = 'NOT'
AND = 'AND'
OR = 'OR'
IMP = 'IMP'
IFF = 'IFF'
PRED = 'PRED'
LEQ = 'LEQ'
HOLE = 'HOLE'
LABEL = 'LABEL'
MAP = {ALL: lambda v,e: AllExpression(v.variable, e),
EXISTS: lambda v,e: ExistsExpression(v.variable, e),
NOT: NegatedExpression,
AND: AndExpression,
OR: OrExpression,
IMP: ImpExpression,
IFF: IffExpression,
PRED: ApplicationExpression}
class Constants(object):
ALL = "ALL"
EXISTS = "EXISTS"
NOT = "NOT"
AND = "AND"
OR = "OR"
IMP = "IMP"
IFF = "IFF"
PRED = "PRED"
LEQ = "LEQ"
HOLE = "HOLE"
LABEL = "LABEL"
MAP = {
ALL: lambda v, e: AllExpression(v.variable, e),
EXISTS: lambda v, e: ExistsExpression(v.variable, e),
NOT: NegatedExpression,
AND: AndExpression,
OR: OrExpression,
IMP: ImpExpression,
IFF: IffExpression,
PRED: ApplicationExpression,
}
def fol(self):
if self.consequent:
accum = None
if self.conds:
accum = reduce(AndExpression, [c.fol() for c in self.conds])
if accum:
accum = ImpExpression(accum, self.consequent.fol())
else:
accum = self.consequent.fol()
for ref in self.refs[::-1]:
accum = AllExpression(ref, accum)
return accum
else:
if not self.conds:
raise Exception("Cannot convert DRS with no conditions to FOL.")
accum = reduce(AndExpression, [c.fol() for c in self.conds])
for ref in map(Variable, self._order_ref_strings(self.refs)[::-1]):
accum = ExistsExpression(ref, accum)
return accum
