LogGamma[z] gives the logarithm of the gamma function log \[CapitalGamma](z).
With <<, you can read files that contain Mathematica expressions given in input form. Sometimes, however, you may instead need to read files of data in other formats. For ...
LibraryFunctionUnload[fun] unloads a LibraryFunction so that it cannot be used.
CoprimeQ[n_1, n_2] yields True if n_1 and n_2 are relatively prime, and yields False otherwise. CoprimeQ[n_1, n_2, ...] yields True if all pairs of the n_i are relatively ...
Divisible[n, m] yields True if n is divisible by m, and yields False if it is not.
ArrayPlot[array] generates a plot in which the values in an array are shown in a discrete array of squares.
Truncation is a setting for the option RoundingRule of SetArithmetic that specifies rounding by discarding excess digits.
NumberPadding is an option for NumberForm and related functions which gives strings to use as padding on the left- and right-hand sides of numbers.
Divisors[n] gives a list of the integers that divide n.
ByteCount[expr] gives the number of bytes used internally by Mathematica to store expr.