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An operator of period 2, i.e., an operator * which satisfies ((a)^*)^*=a.

The mean line segment length l^_ is the average length of a line segment in line segment picking within some given shape. As summarized in the following table (where Delta(3) ...

A set considered together with the sigma-algebra on the set.

The covering of a plane curve with disks of radius epsilon whose centers lie on the curve.

A set M of all polynomials in s variables, x_1, ..., x_s such that if P, P_1, and P_2 are members, then so are P_1+P_2 and QP, where Q is any polynomial in x_1, ..., x_s.

A surface given by the form z=F(x,y).

A nonsingular linear map A:R^n->R^n is orientation-reversing if det(A)<0.

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

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.

A long division in which most or all of the digits are replaced by a symbol (usually asterisks) to form a cryptarithmetic.