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One of the 14 4-polyaboloes.

The trilinear quotient of two points p:q:r and u:v:w is the point p/u:q/v:r/w.

A transformation of the form A^'=UAU^(H), where U^(H) denotes the conjugate transpose.

A homogeneous ideal defining a projective algebraic variety is unmixed if it has no embedded prime divisors.

A formula whose truth table contains only false in any interpretation is called unsatisfiable.

A k-chain whose bounding (k-1)-chain vanishes.

One form of van der Waerden's theorem states that for all positive integers k and r, there exists a constant n(r,k) such that if n_0>=n(r,k) and {1,2,...,n_0} subset C_1 ...

The divisor function sigma_k(n) for n an integer is defined as the sum of the kth powers of the (positive integer) divisors of n, sigma_k(n)=sum_(d|n)d^k. (1) It is ...

For a finite group G, let p(G) be the subgroup generated by all the Sylow p-subgroups of G. If X is a projective curve in characteristic p>0, and if x_0, ..., x_t are points ...

Ahmed's integral is the definite integral int_0^1(tan^(-1)(sqrt(x^2+2)))/(sqrt(x^2+2)(x^2+1))dx=5/(96)pi^2 (OEIS A096615; Ahmed 2002; Borwein et al. 2004, pp. 17-20). This is ...