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A gyrobicupola is a bicupola in which the bases are in opposite orientations.

A square matrix which is not reducible is said to be irreducible.

The main diagonal of a square matrix can be extracted in the Wolfram Language using Tr[m, List].

If the first case of Fermat's last theorem is false for the prime exponent p, then 3^(p-1)=1 (mod p^2).

A bicupola in which the bases are in the same orientation.

In this work, the name Pythagoras's constant will be given to the square root of 2, sqrt(2)=1.4142135623... (1) (OEIS A002193), which the Pythagoreans proved to be ...

The quantity under a radical sign.

A matrix for which horizontal and vertical dimensions are not the same (i.e., an m×n matrix with m!=n).

The number of cells in a generalized Chinese checkers board (or "centered" hexagram). Unlike the polygonal numbers, there is ambiguity in the case of the star numbers as to ...

The universal cover of a connected topological space X is a simply connected space Y with a map f:Y->X that is a covering map. If X is simply connected, i.e., has a trivial ...