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"Term Partition" for Mathematical Induction

Pascal Urso 1 Emmanuel Kounalis 1
1 COPRIN - Constraints solving, optimization and robust interval analysis
CRISAM - Inria Sophia Antipolis - Méditerranée , ENPC - École des Ponts ParisTech
Abstract : A key new concept, {\em term partition}, allows to design a new method for proving theorems whose proof usually requires mathematical induction. A term partition of a term $t$ is a well-defined splitting of $t$ into a pair $(a,b)$ of terms that describes the {\em language of normal forms of the ground instances of $t$}. If $\A {\em monomorphic} set of axioms (rules) and $(a,b)$ is a term partition of $t$, then the normal form (obtained by using $\Aany ground instance of $t$ can be ``divided'' into the normal forms (obtained by using $\Athe corresponding ground instances of $a$ and $b$. Given a conjecture $t = s$ to be checked for inductive validity in a theory $\Aartition $(a,b)$ of $t$ and a partition $(c,d)$ of $s$ is computed. If $a = c$ and $b = d$, then $t = s$ is an inductive theorem of $\A The method is conceptually different to the classical theorem proving approaches since it tries to directly mechanize the $\omega$-rule. It allows to obtain elegant and natural proofs of a large number of conjectures (including non-linear ones) without additional lemmas and/or generalizations.
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https://hal.inria.fr/inria-00072023
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Submitted on : Tuesday, May 23, 2006 - 7:35:03 PM
Last modification on : Saturday, April 7, 2018 - 1:18:26 AM
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Pascal Urso, Emmanuel Kounalis. "Term Partition" for Mathematical Induction. [Research Report] RR-4565, INRIA. 2002. ⟨inria-00072023⟩

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