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Abstract
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Let
denote the
symmetric group on
symbols and let
denote
the standard
-cycle
.
We consider the combinatorial problem of counting
-cycles
so that the
commutator
is
again an
-cycle.
With a constructive recipe, we generate factorially many such
-cycles for
odd
(when
is even, it is easy to
see that no such
-cycles
exist). We apply this to counting certain square-tiled surfaces where
is the number of squares.
Letting
denote the closed,
orientable surface of genus
,
in joint work with Huang, Aougab constructed exponentially many (in
)
mapping class group orbits of pairs of simple closed curves whose complement is a
single topological disk. Our construction produces factorially many (again in
) such
orbits. These new orbits additionally have the property that the absolute value of the
algebraic intersection number is equal to the geometric intersection number, implying
that each pair naturally gives rise to an origami.
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Keywords
curves on surfaces, origamis, flat surfaces, mapping class
groups
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Mathematical Subject Classification
Primary: 57K20, 57M07, 57M15
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Milestones
Received: 24 August 2021
Revised: 18 February 2022
Accepted: 19 February 2022
Published: 19 June 2022
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