Conider the following abstract description for the Quaternion group:
$$\langle x,y\mid x^{4}=1,x^{2}=y^{2},y^{-1}xy=x^{-1}\rangle$$
This description is called a presentation of the Quaternion group via generators and relations.
I am looking for a modern and thorough exposition for presentations of groups because I think it is a fascinating area about which I would like to know more. Are there any books or comprehensive online sources that you could recommend?
Thank you for your ideas!
Best Answer
The answer occurs in the comments above. I summarize