In the link below it is given a very nice proof the fact that: The characteristic of an integral domain is 0 or prime.

For proof

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# Pure Mathematics

## Proof: characteristic of an integral domain is 0 or prime.

## Computation of “CENTER OF A DIHEDRAL GROUP”

## Video Lectures in Modern Algebra

## Proof: group of order 4 is abelian

## Math-202(Algebra I/Linear Algebra) Lectures

## Video Lectures in Mathematics

Its all about pure mathematics.

In the link below it is given a very nice proof the fact that: The characteristic of an integral domain is 0 or prime.

For proof

In the link below, the center of Dihedral group D_n for any positive integer n is computed. It is proved that the

Center of $latex D_n= {1}$, if n is odd &

Center of $latex D_n =\{1, r^{n/2} \}$, if n is even

For proof

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