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IntegerQ
IntegerQ[
expr
] gives True if expr is an integer, and False otherwise.
IntegerQ[
expr
] returns False unless expr is manifestly an integer (i.e., has head Integer).
You can use IntegerQ[
x
]
=
True to override the normal operation of IntegerQ, and effectively define x to be an integer.
See the Mathematica book: Section 2.3.5, Section 3.1.1.
See also: EvenQ, OddQ, NumberQ, TrueQ.
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