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## Main Question or Discussion Point

Hi,

Firstly I am not sure what a group is, after being given the 4 group axioms.

I'm not sure what relevance ''closure'' has ?

and my question is : how to show that for every natural number,n, the set Zn of integers modulo n forms a group under addition modulo n ?

I appreciate any guidance.

Thankyou very much.

Roger

Firstly I am not sure what a group is, after being given the 4 group axioms.

I'm not sure what relevance ''closure'' has ?

and my question is : how to show that for every natural number,n, the set Zn of integers modulo n forms a group under addition modulo n ?

I appreciate any guidance.

Thankyou very much.

Roger