更新历史 - 数学部分简介

refactor(math/index): to be more concise & ontopic (#3646)

feat: add introduction to math in OI (#3604)

style: format markdown files with remark-lint

style: format markdown files with remark-lint

fix(math,geometry) update index.md & move files

style: format markdown files with remark-lint

修正表述

recommit

1. Adjusted categories in "math" 2. Updated "primitive-root.md"

style: format markdown files with remark-lint

Update index.md

fix: 修复表述错误

Update index.md

style: format markdown files with remark-lint

Update index.md

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