EasterSundayGreekOrthodox[year] gives the date of Easter Sunday according to the Greek Orthodox Church using the Gregorian system.
EasterSunday[year] gives the date of Easter Sunday in the Gregorian calendar system.
ApproximateVertexCover[g] produces a vertex cover of graph g whose size is guaranteed to be within twice the optimal size.
Automorphisms[g] gives the automorphism group of the graph g.
CartesianProduct[l_1, l_2] gives the Cartesian product of lists l_1 and l_2.
CliqueQ
(Combinatorica Package Symbol) CliqueQ[g, c] yields True if the list of vertices c defines a clique in graph g.
Cofactor[m, {i, j}] calculates the (i, j)\[Null]^th cofactor of matrix m.
ConstructTableau[p] performs the bumping algorithm repeatedly on each element of permutation p, resulting in a distinct Young tableau.
CostOfPath[g, p] sums up the weights of the edges in graph g defined by the path p.
CyclicGroup[n] returns the cyclic group of permutations on n symbols.