add restriction operator
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@ -193,3 +193,13 @@ __END_OPTIONS_X__
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\newcommand\ab{\text{ab}}
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\newcommand\abelianization{^{\ab}}
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%Taken from user egreg on
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% https://tex.stackexchange.com/a/22255
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\newcommand\restriction[2]{{% we make the whole thing an ordinary symbol
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\left.\kern-\nulldelimiterspace % automatically resize the bar with \right
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#1 % the function
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\vphantom{\big|} % pretend it's a little taller at normal size
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\right|_{#2} % this is the delimiter
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}}
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