 Gersonides wrote "Maaseh Hoshev" in 1321 dealing with arithmetical operations including extraction of square and cube roots, various algebraic identities, certain sums including sums of consecutive integers, squares, and cubes, binomial coefficients, and simple combinatorial identities.The work is notable for its early use of proof by mathematical induction, and pioneering work in combinatorics.The title Maaseh Hoshev literally means a Work of Calculation, but it is also a pun on a biblical phrase meaning "clever work".