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The product of any number of perspectivities.

In general, the opposite of trivial.

A set class which is not a set.

A superset which is not the entire set.

A very useful active feedback method for controlling things like temperature control systems, servo motors, and flow control valves.

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 ...

A ruled semicircle used for measuring and drawing angles.

Combine the two above squares on the left into the single large square on the right.

A plane figure for which quadrature is possible is said to be quadrable.

The word quadrature has (at least) three incompatible meanings. Integration by quadrature either means solving an integral analytically (i.e., symbolically in terms of known ...