Modulo Z2 Invariant: What is it?

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what is modulo associated with z2 invariant?
 
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I don't think I understand your question, can you rephrase/be more specific?
 
i alwyas read word "modulo 2" while reading z2 invariants.
i don't know what does that mean
so asked about that:frown:
 
That means even or odd.

More precisely, modulo 2 means that we are considering two numbers differing by a multiple of two as the same.
 
That is, it can be either 0 or 1.
 

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