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A mathematical object S is said to be multiplicatively closed if a,b in S implies that ab in S.

A quantity which is either 0 (zero) or positive, i.e., >=0.

The number p in a fraction p/q, i.e., the dividend.

1%.

If a is (directly) proportional to b, then a/b is a constant. The relationship is written a proportional b, which implies a=cb, for some constant c known as the constant of ...

In the American system, 10^(51).

A quantity which is subtracted from another (the minuend).

A perspective collineation in which the center and axis are incident.

The straightedge and the compass. The name is due to the fact that connecting points with segments, prolonging segments and drawing circles with a given center and a given ...

Expansion is an affine transformation (sometimes called an enlargement or dilation) in which the scale is increased. It is the opposite of a geometric contraction, and is ...