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Two subspaces S_1 and S_2 of R^n are said to be orthogonal if the dot product v_1·v_2=0 for all vectors v_1 in S_1 and all v_2 in S_2.

Approximants derived by expanding a function as a ratio of two power series and determining both the numerator and denominator coefficients. Padé approximations are usually ...

A 5-polyabolo.

One of the four 5-polyiamonds are called pentiamonds.

A tensor g whose discriminant satisfies g=g_(11)g_(22)-g_(12)^2>0.

The relationship x precedes y is written x≺y. The relation x precedes or is equal to y is written x<=y.

A prime field is a finite field GF(p) for p is prime.

The norm n(a) of a quaternion a=a_1+a_2i+a_3j+a_4k is defined by n(a)=sqrt(aa^_)=sqrt(a^_a)=sqrt(a_1^2+a_2^2+a_3^2+a_4^2), where a^_=a_1-a_2i-a_3j-a_4k is the quaternion ...

In the American system, 10^(45).

A group of five elements, also called a quintuple or pentad.