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  • On the morning of May 30, 1832, two men in Paris fought a duel. Not an unusual event

  • for those days. One of the men was shot in the gut and died the following day. His last

  • words to his brother were "Do not cry, Alfred! I need all my courage to die at 20." His name

  • was Évariste Galois.

  • Galois was a fiercely political mathematical genius. The night before the duel Galois sent

  • several letters. Some were to his political colleagues, but one of his letters in particular

  • has become famous amongst mathematicians. Fearing that he might die, Galois assembled

  • his mathematical discoveries, and sent them to his friend with instructions to pass them

  • along to two of the best mathematicians of the day - Gauss and Jacobi. The papers lay

  • dormant until over a decade later, when the letter made its way to the mathematician Liouville,

  • who took the time to read through the manuscripts and saw to their publication. The world finally

  • learned that as a teenager, Galois had solved one of the most important problems in algebra.

  • In algebra you learn to solve equations. Basic equations are relatively simple - you just

  • solve for x. To solve quadratic equations, you use the quadratic formula. To solve cubic

  • equations, you use the less well-known cubic formula. And to solve equations of degree

  • 4, you use the beastly quartic formula. Does this pattern continue? Are there formulas

  • for equations of degree 5, 6, 7 or higher? What Galois proved is -- no. There are general

  • formulas for solving equations of degrees 1, 2, 3 and 4, but that's it. For degrees

  • 5 and higher, there are no general formulas. To prove this, Galois created new mathematics

  • which we now call "Galois theory" in his honor.

  • I wish I could tell you that if it weren't for some bad luck, Galois was well on his

  • way towards a happy life and a brilliant career. But this is just not the case. His tale was

  • tinged with frustration, trouble and tragedy.

  • Évariste Galois was born in a village outside of Paris. His father became mayor, and his

  • mother was his only teacher until he was 12 years old. When Évariste finally entered

  • school his teachers saw him as intelligent but eccentric. Galois poured through advanced

  • math books and quickly began making discoveries of his own. Unfortunately, he was not very

  • good at patiently explaining his ideas to others. He entered math contests, and sent

  • his work to leading mathematicians, but his writing was considered incomprehensible.

  • We now arrive at a sad sequence of events in his last few years. When he was old enough,

  • Évariste applied to the École Polytechnique - a top university in Paris - but was rejected.

  • Soon after, his father committed suicide. Galois applied again to the Polytechnique

  • and was rejected once more. He then enrolled in a less prestigious university, where he

  • was expelled. He was then arrested a couple of times, endured some heartache, and found

  • himself preparing for a duel which he lost. A troubled genius, indeed.

On the morning of May 30, 1832, two men in Paris fought a duel. Not an unusual event

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ガロア:偉大な思想家の伝記 (Galois: Biography of a Great Thinker)

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    FredGTX に公開 2021 年 01 月 14 日
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