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Re: Integer
*To*: mathgroup at smc.vnet.net
*Subject*: [mg55788] Re: Integer
*From*: Bill Rowe <readnewsciv at earthlink.net>
*Date*: Wed, 6 Apr 2005 03:11:23 -0400 (EDT)
*Sender*: owner-wri-mathgroup at wolfram.com
On 4/5/05 at 3:21 AM, flashlight at student.unibe.ch (Daniel Arnold)
wrote:
>How can I tell Mathematica that n is just an integer variable?
It would be helpful if you indicated how you are using n. A couple of possibilities come to mind.
One might be to create a function of n where n is an integer.
This could be done as
f[n_Integer]:=x^2
That is, I've defined f for integer values only. Any non-integer supplied to f will cause Mathematica to leave f as unevaluated since f is undefined for non-integer values.
Another might be in an expression. For example, Simplify[Sin[n Pi]] returns Sin[n Pi] since n could be any value. But Simplify[Sin[n Pi], Element[n, Integers]] returns 0 since Element[n, Integer] tells Mathematica n is an integer.
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