index battle for proofs involving objects with multiple indices which can be solved by going to the bottom (if anyone wishes to take up the effort). Similar to diagram chasing. left as an exercise to the student Usually reserved for shortcuts which can be clearly filled-in by any member of the audience with the necessary expertise, but are not so trivial as to be solvable by inspection. trivial Similar to clearly. A concept is trivial if it holds by definition, is an immediate corollary to a known statement, or is a simple special case of a more general concept. See also Glossary of mathematics Notes References . . (Parts I and II). . . . . . . . . Jargon Wikipedia glossaries using description lists