An 
-cobordism is a bordism 
between two manifolds 
and 
such that 
is simply connected and
the inclusion maps 
and 
are homotopy
equivalences.
h-Cobordism
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Cite this as:
Weisstein, Eric W. "h-Cobordism." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/h-Cobordism.html