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 The unit has since largely been replaced by the SI unit: candela per square
Pre-measure Σ includes "R"). The infimum of the empty set is taken to be formula_6. Pre-measure In mathematics, a pre-measure is a function that is, in some sense, a precursor to a "bona fide" measure on a given space. Indeed, one of the fundamental theorems in measure theory states that a pre-measure can be extended to a measure. Let "R" be a ring of subsets (closed under union and relative complement) of a fixed set "X" and let "μ": "R" → [0, +∞] be a set function. "μ" is called a pre-measure if and, for every countable (or finite) sequence {"A"}