This paper is devoted to discussing affine Hirsch foliations on
–manifolds.
First, we prove that up to isotopic leaf-conjugacy, every closed orientable
–manifold
admits zero, one or two affine Hirsch foliations. Furthermore, every case is
possible.
Then we analyze the
–manifolds
admitting two affine Hirsch foliations (we call these
Hirsch manifolds). On the one
hand, we construct Hirsch manifolds by using exchangeable braided links (we call
such Hirsch manifolds
DEBL Hirsch manifolds); on the other hand, we show that
every Hirsch manifold virtually is a DEBL Hirsch manifold.
Finally, we show that for every
,
there are only finitely many Hirsch manifolds with strand number
. Here the strand number
of a Hirsch manifold
is a positive integer defined by using strand numbers of braids.
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