# Ｊ・Ｌ・ラグランジュ【1736年1月25日生まれ ~ 1813年4月10日没】

【スポンサーリンク】

その名を全て書き下すと、

ジョゼフ＝ルイ・ラグランジュ

Joseph-Louis Lagrange

## ラグランジュの生きた時代

ラグランジュはイタリアのトリノで生まれ

プロイセン王国・フランスで活躍しました。

そんな彼の生きた人生は革命の起きていた時代でした。

ラグランジュは何故自身が生き延びたか

## ラグランジュの業績

ラグランユアンと呼ぶ関係を多用しました。

ラグランジュ方程式につながります。

## 考え方の有効性

ラグランジュの解析的な考えが有効だったのは

だけではなく物理量の関係を

ラグランジュの使ったような関係で表現します。

つまり、

「ラグランジュアン」と呼ばれる数学形式を使います。

また、ラグランジュはエネルギー保存則から

こういった定式化でのパラダイムシフトが

ラグランジュの未定乗数法や

は誰しもが認める見事なものです。

そして、ラグランジュの名は

【スポンサーリンク】

nowkouji226@gmail.com

2020/10/02_初稿投稿
2022/04/11_改定投稿

【このサイトはAmazonアソシエイトに参加しています】

（2021年8月時点での対応英訳）

If you write down all the names,

Joseph-Louis Lagrange

## The era of Lagrange’s life

Lagrange was born in Turin, Italy and was active in the Kingdom of Prussia, France. His life was a revolutionary era.

When his contemporary Labo Eger was executed, Lagrange might have asked himself why he survived.

Because he was a teacher of Marie Antoinette.

## Lagrange’s achievements

In the academic world, Lagrange has made great achievements. He seems more like his job as a mathematician than as a physicist.

He organizes the mechanical system and promotes the understanding of what is called the Lagrangian form. I also used a lot of relationships called Raglan Yuan when I was a student.

In a field called analytical mechanics, it leads to the Lagrange equation. We are also discussing things that will lead to later number theory, and we are also doing research on celestial bodies.

## Effectiveness of thinking

Lagrange’s analytical idea was effective because it generalizes various physical quantities and leads to a kind of mathematical form called variation.

Later quantum mechanics expresses not only the calculus made by Newton but also the relationship of physical quantities with the relationship used by Lagrange. In other words, it uses a mathematical form called “La Grand Juan”.
In addition, Lagrange derives the principle of minimum action from the law of conservation of energy, and the idea is used not only in mechanics but also in electromagnetism and quantum mechanics. A paradigm shift in these formulations is essential for later systems.

The Lagrange’s undetermined multiplier method and the formalized Lagrange Jean are undisputed and stunning.

And the name of Lagrange is still engraved on the Eiffel Tower. With the work and honor he left behind.