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An n-manifold which cannot be "nontrivially" decomposed into other n-manifolds.

The symbol p^e∥n means, for p a prime, that p^e|n, but p^(e+1)n.

A group that has a primitive group action.

If B superset A (B is a superset of A), then P(A)<=P(B).

A specific prescription for carrying out a task or solving a problem. Also called an algorithm, method, or technique

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.