Two manifolds are said to be diffeomorphic if there exists a diffeomorphism between them.
Diffeomorphic
See also
DiffeomorphismThis entry contributed by David Terr
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Cite this as:
Weisstein, Eric W., with contributions by David Terr. "Diffeomorphic." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/Diffeomorphic.html