nltk.sem.logic.IffExpression

Method

getOp

Undocumented

Inherited from BooleanExpression:

Method

_set_type

:see Expression._set_type()

Inherited from BinaryExpression (via BooleanExpression):

Method	__eq__	Undocumented
Method	__init__	Undocumented
Method	__ne__	Undocumented
Method	__str__	Undocumented
Method	findtype	:see Expression.findtype()
Method	visit	No summary
Instance Variable	first	Undocumented
Instance Variable	second	Undocumented
Property	type	Undocumented
Method	_str_subex	Undocumented

Inherited from Expression (via BooleanExpression, BinaryExpression):

Class Method	fromstring	Undocumented
Method	__and__	Undocumented
Method	__call__	Undocumented
Method	__gt__	Undocumented
Method	__hash__	Undocumented
Method	__lt__	Undocumented
Method	__neg__	Undocumented
Method	__or__	Undocumented
Method	__repr__	Undocumented
Method	applyto	Undocumented
Method	constants	Return a set of individual constants (non-predicates). :return: set of Variable objects
Method	equiv	Check for logical equivalence. Pass the expression (self <-> other) to the theorem prover. If the prover says it is valid, then the self and other are equal.
Method	free	Return a set of all the free (non-bound) variables. This includes both individual and predicate variables, but not constants. :return: set of Variable objects
Method	make_VariableExpression	Undocumented
Method	negate	If this is a negated expression, remove the negation. Otherwise add a negation.
Method	normalize	Rename auto-generated unique variables
Method	predicates	Return a set of predicates (constants, not variables). :return: set of Variable objects
Method	replace	Replace every instance of 'variable' with 'expression' :param variable: Variable The variable to replace :param expression: Expression The expression with which to replace it :param replace_bound: bool Should bound variables be replaced...
Method	simplify	No summary
Method	substitute_bindings	No summary
Method	typecheck	Infer and check types. Raise exceptions if necessary.
Method	variables	Return a set of all the variables for binding substitution. The variables returned include all free (non-bound) individual variables and any variable starting with '?' or '@'. :return: set of Variable objects...
Method	visit_structured	Recursively visit subexpressions. Apply 'function' to each subexpression and pass the result of each function application to the 'combinator' for aggregation. The combinator must have the same signature as the constructor...
Class Variable	_logic_parser	Undocumented
Class Variable	_type_checking_logic_parser	Undocumented