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A cryptarithmetic in which digits are used to represent other digits.

For a finite group of h elements with an n_ith dimensional ith irreducible representation, sum_(i)n_i^2=h.

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

Two quantities y and x are said to be directly proportional, proportional, or "in direct proportion" if y is given by a constant multiple of x, i.e., y=cx for c a constant. ...

A polynomial form which is the sum of two polynomial forms involving separate sets of variables.

Johnson solid J_(90).

This statement seems incomplete. Locate a reference and complete statement of the condition. For any group of k men out of N, there must be at least k jobs for which they are ...

When ac is divisible by a number b that is relatively prime to a, then c must be divisible by b.

The star polygon {12/5}.

Distinguish between smooth manifolds in four dimensions.