Glimpse Albert Einstein's fascinating - sometimes funny - exchanges with great French mathematicians. These formative conversations would go on to shape his ground-breaking scientific work.

Painted portrait of Albert Einstein by Albert Einstein**Académie des sciences**

In 1905, the so-called miraculous year, Albert Einstein published five innovative works on the corpuscular structure of light, an approach to proving the existence of atoms by studying the movement of granules in a liquid, the theory of relativity, and his famous formula E=mc2 - describing the relationship between mass and energy.

Jean Perrin**Académie des sciences**

Jean Perrin is a French physicist. Motivated by Einstein’s theories, he carried out, between 1905 and 1909, experimental research on the movement of granules suspended in a liquid to prove the existence of atoms. This triggered his election to the Académie des Sciences in 1923, and led to his 1926 Nobel Prize in Physics win.

Meeting report from the Académie des sciences in favor of the admission of Albert Einstein Meeting report from the Académie des sciences in favor of the admission of Albert Einstein (1933)**Académie des sciences**

On June 12 1933, Jean Perrin suggested the Academy of Sciences elect Albert Einstein as a foreign associate member. The Academy is one of the world's largest scientific institutions. Einstein gladly accepted this new international recognition.

Jean Perrin's letter to the Minister of Education (1933) by Jean Perrin**Académie des sciences**

On June 26, 1933, the Minister of National Education Anatole de Monzie, received correspondance from the Academy of Sciences announcing the Einstein’s election, and asking him to submit it for approval by Albert Lebrun, President of the Republic.

Lettre from the Académie des sciences to Albert Einstein associated to the admission decret of Albert Einstein (1933)**Académie des sciences**

Albert Einstein responded with this the official letter confirming his election. The Académie des sciences welcomes him onboard. He can now attend the lectures and take part in the Academie’s works.

Official decret confirming the admission of Albert Einstein to the Académie des sciences (1933)**Académie des sciences**

His election became official a few days later.

Receipt from Princeton university (1933)**Académie des sciences**

The election decree was sent to Einstein at Princeton University. With the rise of Hitler to power in Germany, Einstein moved permanently to Princeton in 1933, becoming a lifetime member of the new Institute for advanced study. He stayed for 22 years.

Letter from Albert Einstein to the Permanent secretaries Sir Lacroix - „Westernland“ 14. Octobrer 1933 (1933-10-14) by Albert Einstein**Académie des sciences**

A few months after his election, Einstein - touched by this recognition - thanked the two secretaries of the Academy. He sent a first handwritten letter of thanks to Alfred Lacroix, Permanent Secretary of the 2nd Division (chemical, biological and medical sciences).

Lettre from Albert Einstein to the second Permanent secretary of the Académie des sciences, Princeton 26 December 1933 (1933-12-26) by Albert Einstein**Académie des sciences**

He sends a second typed letter to Émile Picard, Permanent Secretary of the 1st Division of the Academy of Sciences (mathematics and physics).

Page from selection of Einstein's original notes by Albert Einstein**Académie des sciences**

Albert Einstein completes his registration file and returns it.

Photography of Albert Einstein by Albert Einstein**Académie des sciences**

He sends an autographed photo to the Academy.

Solvay Conference 1911 - 1913 by Albert Einstein**Académie des sciences**

Einstein had important exchanges with other members of the Academy, including French physicists and mathematicians like Henri Poincaré, Paul Langevin, Marie Curie, Jean Perrin, Maurice de Broglie, Jacques Hadamard, Paul Painlevé, and Emile Borel. He met them at the international Solvay congresses (in 1911, 1913, and 1927), as well as during visits to France in 1922 and 1929.

Letter from Albert Einstein to Elie Cartan - 21 June1950 (1950-06-21) by Albert Einstein**Académie des sciences**

As a member of the Academy of Sciences, Albert Einstein finds two of his academic friends. This is the mathematician Elie Cartan and physicist Louis de Broglie with whom he has a long correspondence.

Here, a letter, to Elie Cartan, where he evokes the death of a relative of his. He mentions that the passage of time and the "now" are illusory.

Letter from Albert Einstein to Elie Cartan - West Berlin - 26 April1932 (1) (1932-04-26) by Albert Einstein**Académie des sciences**

Another letter to Elie Cartan between 1929 and 1932, Einstein and Cartan exchange many letters, with strong scientific content, and at a steady pace. Cartan takes the trouble to explain in detail to Einstein his theory of "involutionary" differential systems. Einstein is very happy to learn how to use this mathematical theory and thanks Cartan.

Letter from Albert Einstein to Elie Cartan - 16 February 1947 (1947-02-16) by Albert Einstein**Académie des sciences**

In another letter, to Elie Cartan, he alludes to the death of the son of Elijah, killed by the Germans.

Letter from Albert Einstein to Louis de Broglie - 13 November 1929 (1929-11-13) by Albert Einstein**Académie des sciences**

Einstein's correspondence with Louis de Broglie and Elie Cartan sheds a particularly important light on the scientific ideas of the top intellect of the 20th century. This is a letter to Louis de Broglie.

Letter from Albert Einstein to Louis de Broglie - 14 April 1953 (1953-04-14) by Albert Einstein**Académie des sciences**

In 1924, Einstein was the first to understand the importance of Louis de Broglie's ideas concerning the undulatory structure of matter. These ideas led Erwin Schroedinger to write his famous equation in 1926.

In 1953, as in this letter, a dialogue is established between Einstein and Louis de Broglie concerning the interpretation of the wave (psi) appearing in the Schröedinger equation.

In the last paragraph, Albert Einstein humorously quotes the Biblical episode on the Tower of Babel.

Credits: Story

Catherine Bréchignac, physicist, Honorary perpetual Secretary of the Académie des sciences, Delegated ambassador the science, technology and innovation

Thibault Damour, physicist, Laureate of the CNRS gold medal, member of theAcadémie des sciences since 1999

Isabelle Maurin-Joffre, chief curator, director of Académie des sciences archives

Christian Auboyneau, director of sponsorship, development and Rencontres capitales

Credits: All media

The story featured may in some cases have been created by an independent third party and may not always represent the views of the institutions, listed below, who have supplied the content.

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