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That is, if $f: X \rightarrow Y$ and $g:Y \rightarrow Z$ are bundle projections, is $g \circ f: X \rightarrow Z$ a bundle projection? Assume $X$, $Y$ and $Z$ are manifolds. Here is what I know. The answer is affirmative when (1) $f$ is a covering map and $g$ is bundle projection; (2) $f$ is a bundle projection and $g$ is a covering map of finite degree. What can we say about the most general situation? Thanks. |
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Assume all spaces involved That is, if $f: X \rightarrow Y$ and $g:Y \rightarrow Z$ are manifoldsbundle projections, is $g \circ f: X \rightarrow Z$ a bundle projection? Here is what I know. The answer is affirmative when (1) $f$ is a covering map and $g$ is bundle projection; (2) $f$ is a bundle projection and $g$ is a covering map of finite degree. What can we say about the most general situation? Thanks. |
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Is the composition of two bundle projections necessarily a bundle projection?Assume all spaces involved are manifolds.
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