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The simplicial complex formed from a family of objects by taking sets that have nonempty intersections.

A system of parameter chain complexes used for multiplication on differential graded algebras up to homotopy.

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

A 5-polyabolo.

For s_1,s_2=+/-1, lim_(epsilon_1->0; epsilon_2->0)1/(x_1-is_1epsilon_1)1/(x_2-is_2epsilon_2) =[PV(1/(x_1))+ipis_1delta(x_1)][PV(1/(x_2))+ipis_2delta(x_2)] ...

In the American system, 10^(15).

A quadratic field Q(sqrt(D)) with D>0.

A repunit prime is a repunit (i.e., a number consisting of copies of the single digit 1) that is also a prime number. The base-10 repunit (possibly probable) primes ...

rho_(2s)(n)=(pi^s)/(Gamma(s))n^(s-1)sum_(p,q)((S_(p,q))/q)^(2s)e^(2nppii/q), where S_(p,q) is a Gaussian sum, and Gamma(s) is the gamma function.

An alternative spelling of the name "Chebyshev."