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Percolation, the fundamental notion at the heart of percolation theory, is a difficult idea to define precisely though it is quite easy to describe qualitatively. From the ...

There are no fewer than two closely related but somewhat different notions of gerbe in mathematics. For a fixed topological space X, a gerbe on X can refer to a stack of ...

The first definition of the logarithm was constructed by Napier and popularized through his posthumous pamphlet (Napier 1619). It this pamphlet, Napier sought to reduce the ...

The term "recursive function" is often used informally to describe any function that is defined with recursion. There are several formal counterparts to this informal ...

If A and B are equal by definition (i.e., A is defined as B), then this is written symbolically as A=B, A:=B, or sometimes A≜B.

An associative ring, also called a Hecke ring, which has a technical definition in terms of commensurable subgroups.

A birotunda in which the bases are in the same orientation.

An operator definition of a function. A Rodrigues formula may be converted into a Schläfli integral.

An action with G=R^+.

The probability that a statistical test will be positive for a true statistic.