Please forgive me, old self!
Solving problem sheets the right way! Avoid the mistakes that I made.
As a retired mathlete, I still like to think back to the glorious days. In abstract algebra, I would be reminded everywhere of the old days.
Competing at the International Mathematics Competition.
Sometimes people declare redundant axioms. Positivity is one of them.
Chinese is a fascinating language. What about Chimese, though?
On redundant axioms such as commutativity.