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Update docs/math/permutation-group.md
authorWang Anjie <waj19971112@qq.com>
Wed, 7 Aug 2019 09:04:12 +0000 (17:04 +0800)
committerGitHub <noreply@github.com>
Wed, 7 Aug 2019 09:04:12 +0000 (17:04 +0800)
commit4d816a894fbf5f37f133638580ecb2021e959f0d
tree7fa8e4e8065157561254c4d37a09d2c54af5fb39
parent07f4aa01af171c31841bd86ba93638b90d4e490a
Update docs/math/permutation-group.md

use \varnothing rather than \emptyset to represent an empty set

Co-Authored-By: Shuhao Zhang <594422141@qq.com>
docs/math/permutation-group.md