I was very tempted to answer Suggestions for reducing the transmission rate? with the following. In fact I did, but I deleted it again, because I do realize that there is nothing mathematical in my answer, and it goes into a completely different direction than what was actually asked for in the ...
Below, I present an outline of a proof of the first isomorphism theorem for groups. This is how I usually think of the first isomorphism theorem for ______, but groups will get the points across. My question is whether there is any textbook which takes this basic approach.
Let $\pi: C \to L$ b...
@MartinSleziak Indeed, this corresponds to algebra as defined by traditional teaching ("abstract algebra" as people seem to say in US), and not defined as a research field. Nevertheless ra.rings-and-algebras, interpreted in its broad meaning, can encompass this.
@MartinSleziak probably you mean 'etiquette' and not 'ettiquete'. If you understand the meaning of this tag (I don't), it would be a great idea to write some tag info. The additional tags you're proposing seem good.
I have edited the tags on the question about isomorphism theorems. I have added also gr.group-theory - that one seemed reasonable to me, since groups are used there as an example.
@YCor Yes, I meant etiquette. I do not have better description of this tag than "I know it when I see it" - which is rather vague and different users might have quite different views on what belong into the tag.
The tag-info for (etiquette) is rather short both on Mathematics Meta and Meta Stack Exchange - so the tag wikis from there do not help much as a source of inspiration.
@MartinSleziak Oh, the short tag info looks perfectly informative. (Actually I didn't know this meaning of the word 'etiquette' — this is a word of French origin, but in French this means something else, namely "label".)
Below, I present an outline of a proof of the first isomorphism theorem for groups. This is how I usually think of the first isomorphism theorem for ______, but groups will get the points across. My question is whether there is any textbook which takes this basic approach.
Let $\pi: C \to L$ b...
