CoefficientRules¶ Coefficient rules for polynomials. $ wo 'CoefficientRules[0, x]' {} With one argument the variables are detected automatically. $ wo 'CoefficientRules[(x + y)^3]' {{3, 0} -> 1, {2, 1} -> 3, {1, 2} -> 3, {0, 3} -> 1}