= Benson Farb
{c}
<Benson Farb> works on <topology> and <geometric group theory>. His University of Chicago page identifies his research publications and books.https://math.uchicago.edu/~farb/[Author research and book page]{ref}
With <Dan Margalit>, he wrote <A primer on mapping class groups (Version 5.0) by Benson Farb and Dan Margalit>. The book studies symmetries of surfaces up to deformation. A <Dehn twist> is supported in an annulus, yet repeated twisting has a precisely calculable effect on intersection numbers of curves. This links a local geometric operation with the algebra of a <mapping class group>.<A primer on mapping class groups (Version 5.0) by Benson Farb and Dan Margalit>[Sections 3.1–3.2, Proposition 3.2]{ref}
\Image[https://math.uchicago.edu/~farb/bensboard.jpg]
{title=Benson Farb}
{description=Portrait identified by the linked primary author or institutional profile.}
{source=https://math.uchicago.edu/~farb/}
{width=220}
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