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The parameter r (sometimes also denoted mu) in the logistic equation x_(n+1)=rx_n(1-x_n).

Two slant triangular prisms fused together.

Capable of taking on one out of two possible values.

For homogeneous polynomials P and Q of degree n, [P,Q]=sum_(i_1,...,i_n>=0)(i_1!...i_n!)(a_(i,...,i_n)b_(i_1,...,i_n)).

One of the logic operators AND ^ , OR v , and NOT ¬.

The procedure used in subtraction to "borrow" 10 from the next higher digit column in order to obtain a positive difference in the column in question.

The map H_n(X,A)->H_(n-1)(A) appearing in the long exact sequence of a pair axiom.

Solve the Pell equation x^2-92y^2=1 in integers. The smallest solution is x=1151, y=120.

"Brick" is an informal term for a cuboid.

A pair of consecutive numbers.