Paradox of reversibility

Japanese: 可逆性の背理 - かぎゃくせいのはいり
Paradox of reversibility

... In 1876, Boltzmann's colleague J. Loschmidt warned that if the velocities of all molecules were reversed at a given moment, the course of all events would reverse, and therefore it cannot be concluded from the laws of mechanics alone that the H function is decreasing. This is called the paradox of reversibility. If everyday phenomena are reversed, strange things such as rivers flowing backwards would occur, but it is said that materialists at the time were making similar claims. ...

*Some of the terminology explanations that mention the "paradox of reversibility" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

… なお,H定理に対しては1876年,ボルツマンの同僚のJ.ロシュミットは,ある瞬間に全分子の速度を逆転させると全事象の経過は逆行するはずであるから,H関数が減少する一方であることは力学法則だけからは結論できぬとの注意を与えている。これを可逆性の背理と呼ぶ。日常見られる現象を逆行させると,河川の逆流その他奇異なことになるが,当時唯物論者が似たような主張をしていたという。…

※「可逆性の背理」について言及している用語解説の一部を掲載しています。

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