# Mathematician:Hendrik Willem Lenstra Jr.

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## Mathematician

Dutch mathematician working principally in computational number theory.

Well known as the discoverer of the elliptic curve factorization method.

Co-discoverer of the Lenstra-Lenstra-Lovász Lattice Basis Reduction Algorithm.

The Cohen-Lenstra Heuristics, a set of precise conjectures about the structure of class groups of quadratic fields, is named after him.

Brother of Jan Karel Lenstra, Andries Johannes Lenstra and Arjen Klaas Lenstra.

## Nationality

Dutch

## History

- Born: 16 April 1949 in Zaandam

## Theorems and Definitions

- Lenstra-Lenstra-Lovász Lattice Basis Reduction Algorithm (with Arjen Klaas Lenstra and László Lovász)
- Cohen-Lenstra Heuristics (with Henri Cohen)

- Prime Decomposition of 9th Fermat Number (with Arjen Klaas Lenstra, Mark Steven Manasse and John Michael Pollard)

## Publications

- Jul. 1993:
*The Factorization of the Ninth Fermat Number*(*Math. Comp.***Vol. 61**,*no. 203*: pp. 319 – 349) (with A.K. Lenstra, M.S. Manasse and J.M. Pollard) www.jstor.org/stable/2152957