Ran Chen, C. Cohen, J. Lévy, Stephan Merz, L. Théry
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Formal Proofs of Tarjan's Strongly Connected Components Algorithm in Why3, Coq and Isabelle
Comparing provers on a formalization of the same problem is always a valuable exercise. In thispaper, we present the formal proof of correctness of a non-trivial algorithm from graph theory thatwas carried out in three proof assistants: Why3,Coq, and Isabelle.