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A ring is commutative if the multiplication operation is commutative.

All lengths can be expressed as real numbers.

x^(2n)+1=[x^2-2xcos(pi/(2n))+1] ×[x^2-2xcos((3pi)/(2n))+1]×...× ×[x^2-2xcos(((2n-1)pi)/(2n))+1].

If X and Y are independent variates and X+Y is a normal distribution, then both X and Y must have normal distributions. This was proved by Cramér in 1936.

If A and B are equal by definition (i.e., A is defined as B), then this is written symbolically as A=B, A:=B, or sometimes A≜B.

A pair of overdots placed over a symbol, as in x^.., most commonly used to denote a second derivative with respect to time, i.e., x^..=d^2x/dt^2.

An enneacontahedron is a 90-faced polyhedron.

The exists quantifier exists .

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

A function used to study ordinary differential equations.