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Basic conditional statement question.
Here is a question I would think has a simple solution. Let's say I have some variable "a" which is an integer, but I haven't defined it in Mathematica. I want to run a conditional statement on it. Basically If[a!=0,Print["such and such"]] When I do something like this, Mathematica I asume is spitting out a null statement, because it doesn't do anything. So, how can I define "a" such that Mathematica knows it isn't =0 yet, still some integer. The reason I ask is I am calculating Christophel symbols (and such) and many of them =0, so I want to only output those that are not equal to zero. Thanks for any help, Scott