Opuscula Math. 37, no. 3 (2017), 381-388
http://dx.doi.org/10.7494/OpMath.2017.37.3.381

 
Opuscula Mathematica

On the uniform perfectness of equivariant diffeomorphism groups for principal G manifolds

Kazuhiko Fukui

Abstract. We proved in [K. Abe, K. Fukui, On commutators of equivariant diffeomorphisms, Proc. Japan Acad. 54 (1978), 52-54] that the identity component \(\text{Diff}\,^r_{G,c}(M)_0\) of the group of equivariant \(C^r\)-diffeomorphisms of a principal \(G\) bundle \(M\) over a manifold \(B\) is perfect for a compact connected Lie group \(G\) and \(1 \leq r \leq \infty\) (\(r \neq \dim B + 1\)). In this paper, we study the uniform perfectness of the group of equivariant \(C^r\)-diffeomorphisms for a principal \(G\) bundle \(M\) over a manifold \(B\) by relating it to the uniform perfectness of the group of \(C^r\)-diffeomorphisms of \(B\) and show that under a certain condition, \(\text{Diff}\,^r_{G,c}(M)_0\) is uniformly perfect if \(B\) belongs to a certain wide class of manifolds. We characterize the uniform perfectness of the group of equivariant \(C^r\)-diffeomorphisms for principal \(G\) bundles over closed manifolds of dimension less than or equal to 3, and in particular we prove the uniform perfectness of the group for the 3-dimensional case and \(r\neq 4\).

Keywords: uniform perfectness, principal \(G\) manifold, equivariant diffeomorphism.

Mathematics Subject Classification: 58D05, 57R30.

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Cite this article as:
Kazuhiko Fukui, On the uniform perfectness of equivariant diffeomorphism groups for principal G manifolds, Opuscula Math. 37, no. 3 (2017), 381-388, http://dx.doi.org/10.7494/OpMath.2017.37.3.381

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