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arxiv: 1703.02258 · v3 · pith:TR227SR7new · submitted 2017-03-07 · 🧮 math.GT

The mapping class group orbits in the framings of compact surfaces

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keywords caseinvariantclasscompactframingsgroupmappingorbits
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We compute the mapping class group orbits in the homotopy set of framings of a compact connected oriented surface with non-empty boundary. In the case $g > 1$ the computation is some modification of Johnson's results and certain arguments on the Arf invariant, while we need an extra invariant for the genus $1$ case. In addition, we discuss how this invariant behaves in the relative case, which Randal-Williams studied for $g > 1$.

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