3 added 39 characters in body

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.

2 added 341 characters in body; edited body

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.

1

# Is the composition of two bundle projections necessarily a bundle projection?

Assume all spaces involved are manifolds.