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A group in which any decreasing chain of distinct subgroups terminates after a finite number.

If f is continuous on a closed interval [a,b], then there is at least one number x^* in [a,b] such that int_a^bf(x)dx=f(x^*)(b-a). The average value of the function (f^_) on ...

The n-ball, denoted B^n, is the interior of a sphere S^(n-1), and sometimes also called the n-disk. (Although physicists often use the term "sphere" to mean the solid ball, ...

If O_(p^')(G)=1 and if x is a p-element of G, then L_(p^')(C_G(x))<=E(C_G(x)), where L_(p^') is the p-layer.

A surface which has no edges.

A group of sociable numbers of order 3.

A matrix whose eigenvectors are not complete.

The radius of the smallest circle centered at one of the points of an N-cluster, which contains all the points in the N-cluster.

Johnson solid J_(47).

The head of a vector AB^-> is the endpoint B, i.e., the point at which the arrow is placed.