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Datalog is a declarative logic programming language. While it is syntactically a subset of Prolog, Datalog generally uses a bottom-up rather than top-down evaluation model. This difference yields significantly different behavior and properties from Prolog. It is often used as a query language for deductive databases.
Log-normal distribution. In probability theory, a log-normal (or lognormal) distribution is a continuous probability distribution of a random variable whose logarithm is normally distributed. Thus, if the random variable X is log-normally distributed, then Y = ln (X) has a normal distribution.
e. In mathematics, the logarithm is the inverse function to exponentiation. That means that the logarithm of a number x to the base b is the exponent to which b must be raised to produce x. For example, since 1000 = 103, the logarithm base of 1000 is 3, or log10 (1000) = 3.
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Rígsþula. Rígsþula or Rígsmál ( Old Norse: 'The Lay of Ríg') [1] is an Eddic poem, preserved in the manuscript (AM 242 fol, the Codex Wormianus), in which a Norse god named Ríg or Rígr, described as "old and wise, mighty and strong", fathers the social classes of mankind. The prose introduction states that Rígr is another name for ...
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Runlevel. A runlevel is a mode of operation in the computer operating systems that implements Unix System V -style initialization. Conventionally, seven runlevels exist, numbered from zero to six. S is sometimes used as a synonym for one of the levels. Only one runlevel is executed on startup; run levels are not executed one after another (i.e ...