Компьютерная математика Weekly: “just for fun на каникулах: purplesyringa.moe/blog/log-is-non-monotonic…”

Компьютерная математика Weekly @compmathweekly · 1.49K subscribers

Post #153 1.4K Aug 15, 2026, 07:37 UTC

just for fun на каникулах: purplesyringa.moe/blog/log-is-non-monotonic-in-php-and-lua/ — реализация логарифма иногда оказывается немонотонной функцией (и не по той причине, о которой вы, вероятно, подумали)

purplesyringa's blog log is non-monotonic in PHP and Lua If a b 1 and x 1 , you can prove that log a ⁡ x log b ⁡ x . (As a reminder, log a ⁡ x denotes the value t such that x = a t .) This is very intuitive if you think about it: for “normal” numbers, the greater a , the smaller t you will need to get the same…

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