Most rules target JavaScript and TypeScript, but some also lint CSS, HTML, JSON, and Markdown when used with the matching ESLint language plugin.

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The theme of Power World Level 5/10 is pow_two (expansion of squares). The theorem to prove is "for all natural numbers a, a² = a × a". It seems mathematically obvious, but in Lean, you need to ...

Here, I change nothing. I break nothing. I inherit everything as it is." With this declaration, the entire history and all achievements of mathematics—from Peano arithmetic to ZFC set theory, large ...