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OddQ
OddQ[
expr
] gives True if expr is an odd integer, and False otherwise.
OddQ[
expr
] returns False unless expr is manifestly an odd integer (i.e., has head Integer, and is odd).
You can use OddQ[
x
]
=
True to override the normal operation of OddQ, and effectively define x to be an odd integer.
See the Mathematica book: Section 2.3.5, Section 3.1.1.
See also: IntegerQ, EvenQ, TrueQ.
Further Examples
This command forces the constant int1 to be odd.
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