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The double covering group of the (linear) symplectic group.

A term in social choice theory meaning a change favorable for X does not hurt X.

If a prime number divides a norm but not the bases of the norm, it is itself a norm.

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

A conjecture for the eigenvalues of modular forms under Hecke operators.

A type of binary tree.

The Ree group R(q) is the automorphism group of a S(2,q+1,q^3+1) Steiner system.

The Reye graph is the transposition graph G_4 of order 4.

A group which is related to the Taniyama-Shimura conjecture.

A set of sample problems in unconstrained optimization is given by loading Optimization`UnconstrainedProblems` and evaluating $FindMinimumProblems.