FrobeniusSolve[{a_1, ..., a_n}, b] gives a list of all solutions of the Frobenius equation a_1 x_1 + ... + a_n x_n = b.FrobeniusSolve[{a_1, ..., a_n}, b, m] gives at most m ...
FullDefinition[symbol] prints as the definitions given for symbol, and all symbols on which these depend.
GaussianIntegers is an option for FactorInteger, PrimeQ, Factor, and related functions that specifies whether factorization should be done over Gaussian integers.
GeometricMean[list] gives the geometric mean of the values in list.
GoldenRatio is the golden ratio \[Phi] = 1/2 (Sqrt[5] + 1), with numerical value \[TildeEqual] 1.61803.
GraphCenter[g] gives the set of vertices with minimum eccentricity in the graph g.
GraphStyle is an option to Graph and related objects that specifies styles to use for the different graph elements.
GraphUnion[g_1, g_2] gives the graph union of the graphs g_1 and g_2.GraphUnion[g_1, g_2, ...] gives the graph union of g_1, g_2, ....
GroupSetwiseStabilizer[group, {p_1, ..., p_n}] returns the subgroup of group for which the images of the points p_i are still in the list {p_1, ..., p_n}.
HammingDistance[u, v] gives the Hamming distance between strings or vectors u and v.