A map 
from a domain 
is called a map of class 
if each component of
 |
is of class 
(
or 
) in 
, where 
denotes a continuous function which is differentiable
times.
Map Class
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Cite this as:
Weisstein, Eric W. "Map Class." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/MapClass.html