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The property of being degenerate.

Given an undirected graph, a degree sequence is a monotonic nonincreasing sequence of the vertex degrees (valencies) of its graph vertices. The number of degree sequences for ...

The number of degrees of freedom in a problem, distribution, etc., is the number of parameters which may be independently varied.

One of the three 2-polyaboloes.

A metric g_(ij) which is zero for i!=j.

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

The number of digits D in an integer n is the number of numbers in some base (usually 10) required to represent it. The numbers 1 to 9 are therefore single digits, while the ...

The dihedral group D_3 is a particular instance of one of the two distinct abstract groups of group order 6. Unlike the cyclic group C_6 (which is Abelian), D_3 is ...

A general quadratic Diophantine equation in two variables x and y is given by ax^2+cy^2=k, (1) where a, c, and k are specified (positive or negative) integers and x and y are ...

The operator D=-i(d+d^*), where d^* is the adjoint.