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Any link can be represented by a closed braid.

Among the continuous functions on R^n, the positive definite functions are those functions which are the Fourier transforms of nonnegative Borel measures.

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.

A simple graph with n>=3 graph vertices in which each graph vertex has vertex degree >=n/2 has a Hamiltonian cycle.

The product of three translations along the directed sides of a triangle through twice the lengths of these sides is the identity map.

Each centered convex body of sufficiently high dimension has an "almost spherical" k-dimensional central section.

When all the points P on one line are related by an isometry to all points P^' on another, the midpoints of the segments PP^' are either distinct and collinear or coincident.

If a prime number divides a norm but not the bases of the norm, it is itself a norm.

The Fermat number F_n is prime iff 3^(2^(2^n-1))=-1 (mod F_n).

A finite division algebra is a field.