News | Published:

Michel Chasles

Nature volume 23, page 174 | Download Citation

Subjects

Abstract

THE news of the death of Michel Chasles, perhaps the oldest and best-known mathematician in Europe, will be everywhere learned with deep regret. For the fifty-five years over which his writings extend he has devoted himself with persistent industry to the history of geometry and to the perfection of those geometrical methods with which his name will be always associated. The “Apergu historique sur l'Origine et le Développement des Méthodes en Géométrie,” which in fact forms an elaborate history of the subject from the time of Thales and Pythagoras to the beginning of the present century, is the best known of his works; it was first published in 1837, and a second edition appeared only a few years ago. His restoration of the Porisms of Euclid was published in 1860. The last great work of Chasles related to the investigation of the number of conies satisfying any five conditions: the special method which he invented for these researches, termed by him geometrical substitution, involved the consideration of the characteristics of systems of conies, i.e. of the numbers of conies satisfying four common conditions and (1) passing through an assumed point; (2) touching an assumed line.

About this article

Publication history

Published

DOI

https://doi.org/10.1038/023174a0

Authors

    Comments

    By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.

    Newsletter Get the most important science stories of the day, free in your inbox. Sign up for Nature Briefing