Stilb (unit) Stilb (unit) The stilb (sb) is the CGS unit of luminance for objects that are not self-luminous. It is equal to one candela per square centimeter or 10 nits (candelas per square meter). The name was coined by the French physicist André Blondel around 1920. It comes from the Greek word "stilbein" meaning "to glitter". It was in common use in Europe up to World War I. In North America self-explanatory terms such as candle per square inch and candle per square meter were more common. The unit has since largely been replaced by the SI unit: candela per square
Measure (mathematics) if is a finite real number (rather than ∞). Nonzero finite measures are analogous to probability measures in the sense that any finite measure is proportional to the probability measure formula_15. A measure is called "σ-finite" if can be decomposed into a countable union of measurable sets of finite measure. Analogously, a set in a measure space is said to have a "σ-finite measure" if it is a countable union of sets with finite measure. For example, the real numbers with the standard Lebesgue measure are σ-finite but not finite. Consider the closed intervals for all integers ; there are