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Johnson solid J_7.

The Engel expansion, also called the Egyptian product, of a positive real number x is the unique increasing sequence {a_1,a_2,...} of positive integers a_i such that ...

A 19-sided polygon, sometimes also called the enneakaidecagon.

The three diagonal points of a complete quadrilateral are never collinear.

A Fermat pseudoprime to a base a, written psp(a), is a composite number n such that a^(n-1)=1 (mod n), i.e., it satisfies Fermat's little theorem. Sometimes the requirement ...

The index set for the collection of submodules in a graded module.

The integral associated with the Haar measure.

Objects which are identical except for a mirror reflection are said to display handedness and to be chiral.

A lossless data compression algorithm which uses a small number of bits to encode common characters. Huffman coding approximates the probability for each character as a power ...

Determined the possible values of r and n for which there is an identity of the form (x_1^2+...+x_r^2)(y_1^2+...+y_r^2)=z_1^2+...+z_n^2.