10 Answers votes newest views recent 3Is there a notion of congruence relation for essentially algebraic structures? 6Depressed graduate student. 4Characterising extendable automorphisms 1Origins of Mathematical Symbols/Names 6Homological Algebra for Commutative Monoids? 130Famous mathematical quotes (4) 22Why forgetful functors usually have LEFT adjoint? 5In what sense are fields an algebraic theory? 10Most harmful heuristic? 10Why do I find Category Theory mostly just a way to make simple things difficult?