---
title: "1 Etienne Klein Quotes"
description: "Étienne Klein is a French physicist and philosopher of science. A graduate of École Centrale Paris, he holds a DEA in theoretical physics. In June 2026,..."
image: "https://sms4smile.com/quotes/wp-content/uploads/sms4s/authors/processed/b110/author-etienne-klein-236709.jpg"
---

![Portrait of Etienne Klein](https://sms4smile.com/quotes/wp-content/uploads/sms4s/authors/processed/b110/author-etienne-klein-236709.jpg)

# Etienne Klein

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Étienne Klein is a French physicist and philosopher of science. A graduate of École Centrale Paris, he holds a DEA in theoretical physics. In June 2026, Université Paris Cité revoked his PhD in philosophy due to extensive plagiarism in his dissertation.

##  Quotes by Etienne Klein

> [It seems that every practitioner of physics has had to wonder at some point why mathematics and physics have come to be…](https://sms4smile.com/quotes/etienne-klein/it-seems-that-every-practitioner-of-physics-has-had-to-wonder-at-some/)

[Etienne Klein](https://sms4smile.com/quotes/author/etienne-klein/)

[Answers](https://sms4smile.com/quotes/about/answers/)

[Image](https://sms4smile.com/quotes/i/51b/etienne-klein-236709_answers_it-seems-that-every-practitioner-of-phys_1592243.png)

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                        "text": "It seems that every practitioner of physics has had to wonder at some point why mathematics and physics have come to be so closely entwined. Opinions vary on the answer. ..Bertrand Russell acknowledged..'Physics is mathematical not because we know so much about the physical world, but because we know so little.' ..Mathematics may be indispensable to physics, but it obviously does not constitute physics.",
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