Given a subspace 
of a space 
and a map from 
to a space 
, is it possible to extend that map
to a map from 
to 
?
Extension Problem
See also
Lifting ProblemExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Extension Problem." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ExtensionProblem.html