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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.

If a Sylow 2-subgroup T of G lies in a unique maximal 2-local P of G, then P is a "strongly embedded" subgroup of G, and G is known.

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.

The geometric centroid of a quadrilateral lamina is the center of its Wittenbauer's parallelogram.

Exotic cohomology is a cohomology theory that extends index theory to a larger class of manifolds.

Let A and B_j be sets. Conditional probability requires that P(A intersection B_j)=P(A)P(B_j|A), (1) where intersection denotes intersection ("and"), and also that P(A ...