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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.

An integral which has neither limit infinite and from which the integrand does not approach infinity at any point in the range of integration.

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.

The number theta in the quadric (x^2)/(a^2+theta)+(y^2)/(b^2+theta)+(z^2)/(c^2+theta)=1 is called the parameter.