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The map x^' = x+1 (1) y^' = 2x+y+1, (2) which leaves the parabola x^('2)-y^'=(x+1)^2-(2x+y+1)=x^2-y (3) invariant.

Two vectors u and v are parallel if their cross product is zero, i.e., uxv=0.

A statistical test in which assumptions are made about the underlying distribution of observed data.

A partial function is a function that is not total.

A game for which each player has a different set of moves in any position. Every position in an impartial game has a nim-value.

A 5-polyabolo.

A 50-sided polygon.

A group of five elements.

One of the four 5-polyiamonds are called pentiamonds.

The Fermat number F_n is prime iff 3^(2^(2^n-1))=-1 (mod F_n).