# Certification of inequalities involving transcendental functions: combining SDP and max-plus approximation

2 MAXPLUS - Max-plus algebras and mathematics of decision
CMAP - Centre de Mathématiques Appliquées - Ecole Polytechnique, Inria Saclay - Ile de France
4 TYPICAL - Types, Logic and computing
Inria Saclay - Ile de France, LIX - Laboratoire d'informatique de l'École polytechnique [Palaiseau]
Abstract : We consider the problem of certifying an inequality of the form $f(x)\geq 0$, $\forall x\in K$, where $f$ is a multivariate transcendental function, and $K$ is a compact semialgebraic set. We introduce a certification method, combining semialgebraic optimization and max-plus approximation. We assume that $f$ is given by a syntaxic tree, the constituents of which involve semialgebraic operations as well as some transcendental functions like $\cos$, $\sin$, $\exp$, etc. We bound some of these constituents by suprema or infima of quadratic forms (max-plus approximation method, initially introduced in optimal control), leading to semialgebraic optimization problems which we solve by semidefinite relaxations. The max-plus approximation is iteratively refined and combined with branch and bound techniques to reduce the relaxation gap. Illustrative examples of application of this algorithm are provided, explaining how we solved tight inequalities issued from the Flyspeck project (one of the main purposes of which is to certify numerical inequalities used in the proof of the Kepler conjecture by Thomas Hales).
Document type :
Conference papers

https://hal.inria.fr/hal-00932348
Contributor : Xavier Allamigeon <>
Submitted on : Thursday, January 16, 2014 - 5:26:11 PM
Last modification on : Thursday, March 5, 2020 - 6:23:28 PM

### Identifiers

• HAL Id : hal-00932348, version 1
• ARXIV : 1307.7002

### Citation

Xavier Allamigeon, Stéphane Gaubert, Victor Magron, Benjamin Werner. Certification of inequalities involving transcendental functions: combining SDP and max-plus approximation. European Control Conference (ECC'13), Jul 2013, Zurich, Switzerland. pp.2244 - 2250. ⟨hal-00932348⟩

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