A Verified Implementation of Algebraic Numbers in Isabelle/HOL

Sebastiaan Joosten, René Thiemann, Akihisa Yamada

Journal of Automated Reasoning 64, pp. 363 – 389, 2020.


We formalize algebraic numbers in Isabelle/HOL. Our development serves as a verified implementation of algebraic operations on real and complex numbers. We moreover provide algorithms that can identify all the real or complex roots of rational polynomials, and two implementations to display algebraic numbers, an approximative version and an injective precise one. We obtain verified Haskell code for these operations via Isabelle’s code generator.

The development combines various existing formalizations such as matrices, Sturm’s theorem, and polynomial factorization, and it includes new formalizations about bivariate polynomials, unique factorization domains, resultants and subresultants.


  PDF |    doi:10.1007/s10817-018-09504-w  


author = "Sebastiaan Joosten and Ren\'e Thiemann and Akihisa Yamada",
title = "A Verified Implementation of Algebraic Numbers in Isabelle/HOL",
journal = "Journal of Automated Reasoning",
year = 2020,
doi = "10.1007/s10817-018-09504-w",
note = "Online first."
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