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Non-commutative rings and algebras, non-associative algebras. Can be used in combination with ra.rings-and-algebras

4 votes

What do you do if you believe a problem is undecidable?

Joel David Hamkins has given a good answer in the case of (2), where a certain notion when expressed formally in the language of a theory $T$ (and also the negation of this notion) may not be provable …
Gerhard Paseman's user avatar
0 votes

An "Elementary" Math Question Generalized (Ring Theory Perhaps)

Let me suggest the following for the metacognition part of your post, even though that part did not receive the main emphasis. Plant 10 trees in 5 rows with 4 trees in each row. I use this example …
Gerhard Paseman's user avatar