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