Constrained term rewriting tool. This paper discusses Ctrl, a tool to analyse – both automatically and manually – term rewriting with logical constraints. Ctrl can be used with TRSs on arbitrary underlying logics, and automatically analyse various properties such as termination, confluence and quasi-reductivity. Ctrl also offers both a manual and automatic mode for equivalence tests using inductive theorem proving, giving support for and verification of “hand-written” term equivalence proofs.

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