Hartley function

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English

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Hartley function

Etymology

Introduced by Ralph Hartley in 1928.

Proper noun

the Hartley function

(mathematics) A measure of uncertainty. If a sample from a finite set A uniformly at random is picked, the information revealed after the outcome is known is given by the Hartley function $H_{0}(A):=\mathrm {log} _{b}\vert A\vert$ , where $\vert A\vert$ denotes the cardinality of A.

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