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In this case study, we illustrate the great potential of experimentalmathematics and symbolic computation, by rederiving, ab initio, Onsager'scelebrated solution of the twodimensional Ising model in zero magnetic field.Onsager's derivation is extremely complicated and ad hoc, as are all thesubsequent proofs. Unlike Onsager's, our derivation is not rigorous, yet it isabsolutely certain (even if Onsager did not do it before), and should have beenacceptable to physicists who do not share mathematicians' fanatical (and oftenmisplaced) insistence on rigor.

A Simple Re-Derivation of Onsager's Solution of the 2D Ising Model using Experimental Mathematics