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The difference of two numbers n_1 and n_2 is n_1-n_2, where the minus sign denotes subtraction.

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. ...

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

In the American system, 10^(39).

An equilibrium point in game theory is a set of strategies {x^^_1,...,x^^_n} such that the ith payoff function K_i(x) is larger or equal for any other ith strategy, i.e., ...

A tree spread in which each node has a finite number of children.

The order of a finite field is the number of elements it contains.

A mathematical object invented to solve irreducible congruences of the form F(x)=0 (mod p), where p is prime.