Integers
 Usage
• Integers represents the domain of integers, as in x  Integers.
Notes
• x  Integers evaluates immediately only if x is a numeric quantity. • Simplify[expr  Integers] can be used to try to determine whether an expression is an integer. • IntegerQ[expr] tests only whether expr is manifestly an integer (i.e., has head Integer). • New in Version 4.
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