This work concerns the diffeomorphism groups of 3-manifolds, in
particular of elliptic 3-manifolds. These are the closed
3-manifolds that admit a Riemannian metric of constant positive
curvature, now known to be exactly the closed 3-manifolds that have
a finite fundamental group. The (Generalized) Smale Conjecture
asserts that for any elliptic 3-manifold M, the inclusion from the
isometry group of M to its diffeomorphism group is a homotopy
equivalence. The original Smale Conjecture, for the 3-sphere, was
proven by J. Cerf and A. Hatcher, and N. Ivanov proved the
generalized conjecture for many of the elliptic 3-manifolds that
contain a geometrically incompressible Klein bottle.
The main results establish the Smale Conjecture for all elliptic
3-manifolds containing geometrically incompressible Klein bottles,
and for all lens spaces L(m, q) with m at least 3. Additional
results imply that for a Haken Seifert-fibered 3 manifold V, the
space of Seifert fiberings has contractible components, and apart
from a small list of known exceptions, is contractible.
Considerable foundational and background
General
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