Photography. a graph used in sensitometry to show the relationship between exposure time and image density under constant developing conditions.
(photog) a graph of the density of a particular photographic material plotted against the logarithm of the exposure producing this density


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  • Charcot

    Jean Baptiste Étienne Auguste [zhahn ba-teest ey-tyen oh-gyst] /ʒɑ̃ baˈtist eɪˈtyɛn oʊˈgüst/ (Show IPA), 1867–1936, French explorer. his father, Jean Martin [zhahn mar-tan] /ʒɑ̃ marˈtɛ̃/ (Show IPA), 1825–93, French neuropathologist. noun Jean Martin (ʒɑ̃ martɛ̃). 1825–93, French neurologist, noted for his attempt using hypnotism to find an organic cause for hysteria, which influenced Freud Charcot […]

  • Characteristic-function

    a function defined on a given set, having value 1 for every element of the set and value 0 for every element not contained in the set. characteristic polynomial. noun (maths) a function that assigns the value 1 to the members of a given set and the value 0 to its nonmembers (statistics) a function […]

  • Characteristic-polynomial

    an expression obtained from a given matrix by taking the determinant of the difference between the matrix and an arbitrary variable times the identity matrix.

  • Characteristic-root

    a scalar for which there exists a nonzero vector such that the scalar times the vector equals the value of the vector under a given linear transformation on a vector space. a root of the characteristic equation of a given matrix.

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