[Help-glpk] Odd/even variable constraint?

[Rory Winston]

Hi

Does anyone know how I can express a constraint that a variable must be odd
or even, i.e. in the form 2*n-1 or 2*n + 1? I am trying to write a mathprog
script to find pythagorean triples subject to certain constraints, and i
would like to express some conditions on my variables, namely, that one must
be an odd integer, and the other must be an even integer.

Thanks!
Rory
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