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A decagon is a ten-sided polygon. Several special types of decagons are illustrated above. In particular, a decagon with vertices equally spaced around a circle and with all ...

A branch of game theory dealing with strategies to maximize the outcome of a given process in the face of uncertain conditions.

Given a Jacobi amplitude phi and a elliptic modulus m in an elliptic integral, Delta(phi)=sqrt(1-msin^2phi).

A 6-piece polycube dissection of the 3×3 cube.

The envelope of refracted rays for a given curve.

Two manifolds are said to be diffeomorphic if there exists a diffeomorphism between them.

Let G be group of group order h and D be a set of k elements of G. If the set of differences d_i-d_j contains every nonzero element of G exactly lambda times, then D is a ...

The dihedral group D_2 is a point group that is isomorphic to the vierergruppe and the finite group C_2×C_2.

R^n is homeomorphic to R^m iff n=m. This theorem was first proved by Brouwer.

A notation invented by Dirac which is very useful in quantum mechanics. The notation defines the "ket" vector, denoted |psi>, and its conjugate transpose, called the "bra" ...