Proper

In general, the opposite of trivial.

See also

Proper Divisor, Proper Ideal, Proper Subset, Proper Class, Proper Submodule, Proper Fraction, Proper Subfield, Proper Extension, Proper Superset, Trivial

Cite this as:

Weisstein, Eric W. "Proper." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Proper.html