Pédagogie et vulgarisation

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25/11/2025

14/05/2024

Astrophysics aims to understand cosmic phenomena at various scales, including the formation of the solar system and galactic dynamics.

14/05/2024

An artifact is an accidental or artificial structure that appears during an experiment or observation. Numerical simulations constantly strive to avoid it.

14/05/2024

The Epistémotron project is a tutorial designed to build an automatic scientific discovery generator.

14/05/2024

The animation created in 1992 by Frédéric Landsheat was rejected by several scientific journals.

14/05/2024

Gravitational instability, or Jeans instability, is studied in the context of a sphere of dust with constant density.

26/04/2024

The drawing made with a ballpoint pen can produce remarkable results, as demonstrated by the sketches created during trips to Iceland.

26/04/2024

Lithography is a printing technique using a lithographic stone, developed in the 19th century.

10/05/2023

The article discusses the discovery of an implicit equation by Professor Tardy, called the 'Tardy bitoid'.

10/05/2023

A user recounts his experience with the program 'Marriage 1.0,' which installs unexpectedly and causes technical problems.

10/05/2023

A user reports problems with the Ehefrau 1.0 software, which has undocumented features and causes conflicts with other programs.

01/11/2022

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01/11/2022

The song talks about Cupid as a close friend, describing his role in love.

01/11/2022

The song tells of a ball in the small suburb where a love story unfolds.

01/11/2022

The song evokes researchers and their work in various scientific fields.

13/10/2022

Page created on October 13, 2022, gathering 74 stories by Jean-Pierre Petit.

04/11/2020

04/11/2020

The document explains how to use Cosmo Player to display objects in virtual reality.

04/11/2020

The text talks about the cube inversion, a mathematical model.

04/11/2020

The page presents a polyhedral version of an object that can be constructed from cardboard.

04/11/2020

The 'Boy-cube' is an improved version of the Boy surface.

04/11/2020

The Klein bottle is a complex mathematical object, represented here in an unusual form.

04/11/2020

The lacteal surface is a mathematical surface first described in 1956 by Grossman.

04/11/2020

The text presents a central model of the cube inversion, created by J.P. Petit in 1991.

04/11/2020

The central model of the cube inversion is presented, with imagery from C.TARDY.

04/11/2020

The document presents virtual reality images and explains how to download and use Cosmo Player.

04/11/2020

Three-half-twist polyhedral Möbius strip.

04/11/2020

The text presents an analytical representation of the Boy surface, an immersion of the projective plane in R3.

04/11/2020

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04/11/2020

The object is a variation of the Möbius strip with three half-twists.

04/11/2020

The Möbius strip is a simple yet fascinating object, created by giving a belt a half-twist.

04/11/2020

The monohedron is a polyhedron composed of a single face and a single edge.

04/11/2020

Central model of the cube flip, to print and copy.

04/11/2020

The text explains the turning inside out of a sphere and a cube, using polyhedral models.

04/11/2020

The text explains how to transform a crosscap into a Boy surface via the Roman surface of Steiner.

04/11/2020

The article explains the transformation of a crosscap into a Boy's surface through the Roman surface of Steiner.

04/11/2020

This text explains how to transform a crosscap into a Boy's surface through the Roman surface of Steiner.

04/11/2020

This document explains how to transform a crosscap into a Boy's surface using the Roman surface of Steiner.

04/11/2020

The trefoil knot is a complex geometric shape.

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The text explains the concept of 'sphere eversion' and the associated mathematical challenges.

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The document explains how to transform a Cross Cap surface into a Boy surface by passing through the Steiner Roman surface.

04/11/2020

This document explains how to transform a Cross Cap surface into a Boy surface via the Roman Steiner surface.

04/11/2020

The document explains how to transform a Cross Cap surface into a Boy surface through the Steiner Roman surface.

04/11/2020

The document explains how to transform a Cross Cap surface into a Boy surface via the Roman surface of Steiner.

04/11/2020

This document explains how to transform a Cross Cap surface into a Boy surface through the Steiner Roman surface.

04/11/2020

The text tells the story of the creation of a physical representation of the Boy's surface, made using copper wire.

04/11/2020

The text presents the non-trivial turning inside-out of the torus, a complex mathematical transformation.

04/11/2020

04/11/2020

The text explains how to turn a torus inside out in a simple way, unlike a sphere.

04/11/2020

04/11/2020

The text explains the process of turning the sphere, using mathematical concepts and illustrations.

04/11/2020

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The text explains the four elementary catastrophes related to the sphere inversion, with examples such as the 'elbow catastrophe' and the 'orange slice.'

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The text explains how the inversion of the sphere can permute the cusp points of a crosscap.

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04/11/2020

The text explores the concepts of closed surfaces, such as the sphere and the torus, by representing them in three-dimensional Euclidean space.

04/11/2020

04/11/2020

The document deals with the inversion of the sphere and concepts related to geometry and topology.

04/11/2020

The page explains the Steiner and the 'Steiner cube'.

04/11/2020

The 'cube-torus' is a geometric concept difficult to visualize.

04/11/2020

04/11/2020

The torus is a geometric shape studied in mathematics.

04/11/2020

The page presents a polyhedral version of the Withney umbrella.

04/11/2020

Withney's umbrella is an object invented by a mathematician who was also a tightrope walker.

05/11/2019

Page offering free downloadable books, including comic strips in French.

18/05/2018

Light can be decomposed into spectra using gratings, which diffract the light into two symmetric spectra.

13/05/2018

Page describing the definition of styles to encourage a scientist and an author.

02/04/2018

02/09/2017

05/07/2017

27/09/2016

A video showing tornadoes was analyzed and declared to be computer-generated images.

04/06/2016

The text explains the four elementary catastrophes related to the sphere inversion, with examples such as the 'elbow catastrophe' and the 'orange slice.'

04/06/2016

The text explains the process of turning a sphere inside out, using mathematical concepts and illustrative figures.

04/06/2016

The text explains how to turn a torus inside out, unlike a sphere.

04/06/2016

The text explains how flipping the sphere allows swapping the cusp points of a Crosscap.

04/06/2016

The text explores the concepts of closed surfaces such as the sphere and the torus, distinguishing between embeddings and immersions.

04/06/2016

The document deals with the sphere eversion and various stories related to geometry and topology.

04/06/2016

The text presents the non-trivial turning of the torus, a mathematical concept related to topology.

07/04/2016

Cataract surgery involves replacing the cloudy lens with an implant. The procedure takes about fifteen minutes and does not require hospitalization.

18/12/2015

The Wendelstein 7-X Stellarator is a complex machine designed to confine a high-temperature plasma, after 19 years of construction.

26/09/2015

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An orthogonal matrix is a matrix whose inverse is equal to its transpose. Its determinant is ±1.

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The group O(2) consists of two components: the neutral component SO(2) and the rest of the elements.

26/09/2015

The classification of objects is based on their common properties and invariance under certain transformations.

26/09/2015

26/09/2015

The theory of groups includes the concept of the inverse of an element, which must satisfy certain conditions.

16/09/2015

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04/09/2015

The text explains the geological formation of the Mées massif, composed of puddingstone, a mixture of earth and pebbles.

24/12/2014

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26/03/2013

Komodo dragons are giant monitors that have survived for 150 million years. They live on islands located east of Bali.

17/03/2013

The article talks about the risks of extreme apnea, especially the destruction of neurons and heart cells.

08/02/2013

The article addresses the case of a veiled woman who was fined, highlighting social and religious issues.

04/01/2013

The article addresses the weaknesses of Japanese nuclear reactors, particularly boiling water reactors (BWR).

20/10/2012

The text describes Baumgartner's free fall from 39,000 meters, reaching the speed of sound.

19/10/2012

06/07/2012

10/05/2012

18/04/2012

Jean-Pierre Petit receives many emails every day and has trouble answering them all.

23/03/2012

11/03/2012

The text presents a mathematical monohedron with a single face and a single side, illustrating a complex geometric structure.

11/03/2012

12/02/2012

The article explores the anatomical characteristics of Homo sapiens and compares those of primates.

07/01/2012

The author sold a Boy surface, a complex mathematical object, to a Belgian doctor.

21/08/2011

Quaternions are a number field that allows representing the sphere S3. They are constructed from 2x2 matrices with complex coefficients.

21/08/2011

21/08/2011

The document explains how to transform a Cross Cap surface into a Boy surface through the Steiner Roman surface.

21/08/2011

The document explains how to transform a Cross Cap surface into a Boy surface by means of the Steiner Roman surface.

21/08/2011

The document explains how to transform a Cross Cap surface into a Boy surface by passing through the Steiner Roman surface.

21/08/2011

The 'Klein-cube' was presented in 1983 in the comic book 'Le Topologicon'.

21/08/2011

This document deals with the transformation of a Cross Cap surface into a Boy surface.

21/08/2011

Untitled document featuring a Klein bottle.

21/08/2011

The text discusses the inversion of the cube, a complex mathematical model.

21/08/2011

The text talks about a polyhedral version of an object that can be constructed from cardboard.

21/08/2011

The Klein bottle is a complex mathematical object, represented here in an unusual form.

21/08/2011

The 'Boy-cube' is a polyhedral version of the Boy surface.

21/08/2011

The text explains the concept of 'sphere eversion' and the associated mathematical challenges.

21/08/2011

Withney's umbrella was invented by a mathematician who was also a tightrope walker.

21/08/2011

The lacteal surface is a mathematical surface first described in 1956 by Grossman.

21/08/2011

21/08/2011

The central model of the cube inversion is a polyhedral representation.

21/08/2011

The page explains the Steiner and the 'Steiner-cube'.

21/08/2011

The text recounts the story of the creation of a representation of the Boy surface, realized by J.P. Petit and J. Souriau.

21/08/2011

21/08/2011

Three-half-twist polyhedral Möbius strip.

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The text presents an analytical representation of the Boy surface, an immersion of the projective plane in R3.

21/08/2011

The document presents a triangular puzzle with a solution dated January 25, 2006.

21/08/2011

This document explains how to transform a crosscap into a Boy's surface using the Roman surface of Steiner.

21/08/2011

21/08/2011

Explanation of the transformation of a crosscap into a Boy surface via the Roman surface of Steiner.

21/08/2011

21/08/2011

This text explains how to transform a crosscap into a Boy surface by passing through the Roman surface of Steiner.

21/08/2011

21/08/2011

The text explains how to transform a crosscap into a Boy surface via the Roman surface of Steiner.

21/08/2011

21/08/2011

The text presents a polyhedral model of the cube inversion, inspired by the work of Bernard Morin on the sphere inversion.

21/08/2011

21/08/2011

Central model of the cube flip, to print and copy.

21/08/2011

21/08/2011

21/08/2011

The trefoil knot is a complex geometric shape.

21/08/2011

21/08/2011

The monohedron is a polyhedron composed of a single face and a single edge.

21/08/2011

21/08/2011

The Möbius strip is a simple but fascinating object, created by a half-twist of a belt.

21/08/2011

The document explains how to transform a Cross Cap surface into a Boy surface through the Steiner Roman surface.

21/08/2011

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21/08/2011

The object is a variation of the Möbius strip with three half-turns.

07/08/2011

The page mentions various potential dangers, particularly those related to health and safety.

22/06/2011

The text explains how children learn to classify objects according to their properties, such as shape or motion.

22/06/2011

25/03/2011

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11/02/2011

Introduction to the theory of twin universes and their repulsive effect on the expansion of the universe.

26/11/2010

The article presents various optical illusions and explains how they work in relation to visual perception and the brain.

01/10/2010

The document discusses the development of the electric airplane and the electric bicycle, with examples such as the Gitane G-bike.

19/07/2010

Real Player is a little-used media player that requires a heavy installation.

27/06/2010

26/06/2010

The article describes an experience presenting a mathematical idea about transforming a right-handed Boy surface into a left-handed Boy surface.

22/06/2010

The oil spill in the Gulf of Mexico occurred following an accident during offshore drilling, resulting in a massive oil leak.

22/06/2010

06/05/2010

04/05/2010

En mai 2008, une vague d'observations d'ovnis a eu lieu en Bretagne. La chaîne TF1 a couvert l'événement dans son journal de 13 heures.

04/05/2010

Page titled 'Untitled Document'.

04/05/2010

The text discusses the debate on prostate cancer screening, particularly through PSA testing and rectal examination.

02/05/2010