Lighting a particular area, and falls within a given solid angle. The SI unit for luminance is candela per square metre (cd/m). The CGS unit of luminance is the stilb, which is equal to one candela per square centimetre or 10 kcd/m. The amount of useful light emitted from a source or the luminous flux is measured in lumen (lm). The SI unit of illuminance and luminous emittance, being the luminous power per area, is measured in Lux. It is used in photometry as a measure of the intensity, as perceived by the human eye, of light that hits or passes
Curvature of a measure by One may also refer to the curvature of "μ" at a given point "x": in which case In this section, R is thought of as the complex plane C. Melnikov and Verdera (1995) showed the precise relation of the boundedness of the Cauchy kernel to the curvature of measures. They proved that if there is some constant "C" such that for all "x" in C and all "r" > 0, then there is another constant "C", depending only on "C", such that for all "ε" > 0. Here "c" denotes a truncated version of the Menger-Melnikov curvature in which