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Smooth cubic surface, dating from 1920-1930 and moulded in a thermoplastic material using a plaster model, attributed to Christian Juel, a Danish mathematician. The surface is marked with 27 real lines in textile thread. It forms part of a collection of mathematical objects at the Institut Henri Poincaré (IHP).

Wire surface based on a helix and created by Joseph Caron, professor of descriptive geometry at the École normale supérieure (ENS), on 16 November 1914. It is traced on a cylinder of radius r, rolled up in a coaxial cylinder of radius R > r. The surface contains three families of helices: those belonging to the cylinder of radius r are red, those belonging to the cylinder of radius R - r are blue, and those belonging to the cylinder of radius R are yellow. It forms part of a collection of…

Wire surface based on a helix and created by Joseph Caron, professor of descriptive geometry at the École normale supérieure (ENS), on 16 November 1914. It is traced on a cylinder of radius r, rolled up in a coaxial cylinder of radius R > r. The surface contains three families of helices: those belonging to the cylinder of radius r are red, those belonging to the cylinder of radius R - r are blue, and those belonging to the cylinder of radius R are yellow. It forms part of a collection of…

Wire model on a brass structure, representing a cubic cone of genus 1. This model was created by Hermann Wiener, professor of mathematics at the Karlsruhe Institute of Technology in Germany, in 1899. It forms part of a collection of mathematical objects at the Institut Henri Poincaré (IHP).

Kummer quartic surface with eight real double points and eight imaginary double points. It was created by Karl Rohn, a German mathematician, in 1899. It has eight real double planes that meet the surface along eight conics marked on the model in plaster. It forms part of a collection of mathematical objects at the Institut Henri Poincaré (IHP).

Wooden model illustrating the evolution of a wavefront, created by Joseph Caron, professor of descriptive geometry at the École normale supérieure (ENS), in February 1914. It forms part of a collection of mathematical objects at the Institut Henri Poincaré (IHP).

Cardboard model representing circles of curvature in a hyperbolic point, created by C. Tesch in 1894. It forms part of a collection of mathematical objects at the Institut Henri Poincaré (IHP).

Cardboard model representing circles of curvature in a hyperbolic point, created by C. Tesch in 1894. It forms part of a collection of mathematical objects at the Institut Henri Poincaré (IHP).

Bibliothèque de l'institut Henri Poincaré, lieu de rencontre pour les mathématiciens et les physiciens théoriciens.

Bibliothèque de l'institut Henri Poincaré, lieu de rencontre pour les mathématiciens et les physiciens théoriciens.

Bibliothèque de l'institut Henri Poincaré, lieu de rencontre pour les mathématiciens et les physiciens théoriciens.