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The braced square problem asks, given a hinged square composed of four equal rods (indicated by the red lines above), how many more hinged rods must be added in the same ...

A graph cycle.

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).