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Update index.md
author雷蒻 <34390285+hsfzLZH1@users.noreply.github.com>
Thu, 18 Jul 2019 08:19:24 +0000 (16:19 +0800)
committerGitHub <noreply@github.com>
Thu, 18 Jul 2019 08:19:24 +0000 (16:19 +0800)
commit04ac515495cb7f1bbd351afdfd757a92470c5cc3
treea85d47f581134cbe0c155bd5b375aadeb3502aa6
parent453b821810458a7f73837c32f3fbd427d199c5b3
Update index.md

统一大 O 记号为一般斜体
docs/math/index.md