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A module over a ring that is contained in and has the same addition as another module over the same ring.

A system of equations is any set of simultaneous equations.

Two curves are tangent externally at a point P if they lie on opposite sides of their common tangent at P

An alternative spelling of the name "Chebyshev."

A 40-sided polygon.

A set of four, also called a quartet.

One of the four 3-polyaboloes.

The truncated dodecahedron is the 32-faced Archimedean solid with faces 20{3}+12{10}. It is also uniform polyhedron with Maeder index 26 (Maeder 1997), Wenninger index 10 ...

A statistical distribution such as the normal distribution which has a single "peak."

A transformation of the form A^'=UAU^(H), where U^(H) denotes the conjugate transpose.