American Mathematical Monthly · 1971 · 617 citations · 0 references
Natural SciencesMathematicsCombinatoricsDiscrete MathematicsSet TheoryAlgebraic CombinatoricsCombinatorial EnumerationCombinatorial OptimizationCombinatorial Set TheoryEnumerative CombinatoricsGenerating FunctionsCombinatorial IdentitiesCombinatorial RepresentationsEnumeration Of Combinatorial Classes