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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 ...

A base-60, or sexagesimal, number system, used by the ancient Babylonians.

The Diophantine equation x^2+k=y^3, which is also an elliptic curve. The general equation is still the focus of ongoing study.

A topological space X in which each subset of X of the "first category" has an empty interior. A topological space which is homeomorphic to a complete metric space is a Baire ...

The number 13.

An "area" which can be defined for every set--even those without a true geometric area--which is rigid and finitely additive.

A vector field u satisfying the vector identity ux(del xu)=0 where AxB is the cross product and del xA is the curl is said to be a Beltrami field.

An estimator which exhibits estimator bias.

A statistical distribution having two separated peaks.

An interval into which a given data point does or does not fall.