def sideEffects(self, knownTruth):
'''
Yield side-effect methods to try when the element is proven to be in the set of Booleans
by calling 'inBoolSideEffects' on the element if it has such a method.
'''
from proveit.logic.boolean._theorems_ import unfoldInBool
if hasattr(self.element, 'inBoolSideEffects'):
for sideEffect in self.element.inBoolSideEffects(knownTruth):
yield sideEffect
# don't automatically do unfoldInBoolExplicit if unfoldInBool is unusable -- avoids infinite recursion
if unfoldInBool.isUsable():
yield self.unfold
def unfold(self, assumptions=USE_DEFAULTS):
'''
From inBool(Element), derive and return [element or not(element)] if
unfoldInBool is usable. It it is not, instead try to derive and return
[(element=TRUE) or (element=FALSE)].
'''
from ._theorems_ import unfoldInBool, unfoldInBoolExplicit
if unfoldInBool.isUsable():
# [element or not(element)] assuming inBool(element)
return unfoldInBool.specialize({A:self.element}, assumptions=assumptions)
else:
# [(element = TRUE) or (element = FALSE)] assuming inBool(element)
return unfoldInBoolExplicit.specialize({A:self.element}, assumptions=assumptions)