Mathematics A to Z: Part 4

Last summer, Nebus Research had a fun series on the definitions of 26 different mathematical terms, one for each letter of the alphabet. Here are the words from P to T:

P is for proper, a synonym for non-trivial.

Q is for quintile, which is similar to “percentile” from descriptive statistics.

R is for ring, a concept from abstract algebra (along with “group” and “field”). I had not known, before reading this post, that there was actually controversy behind how a ring should be defined.

S is for step, as in “How many steps does this proof require?” (I distinctly remember a two-column proof from my high-school geometry class that required something like 80 or 100 steps and the exhilarating triumph of completing it.)

T is for tensor, a generalization of matrices.

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