provide operator for free product of groups
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@ -175,3 +175,5 @@
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\DeclarePairedDelimiter\norm{\lVert}{\rVert}
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\DeclarePairedDelimiter\norm{\lVert}{\rVert}
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\let\oldnorm\norm
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\let\oldnorm\norm
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\def\norm{\@ifstar{\oldnorm}{\oldnorm*}}
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\def\norm{\@ifstar{\oldnorm}{\oldnorm*}}
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\DeclareMathOperator{\amalgprod}{\star}
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