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Let 
 be the set of continuous mappings 
.  Then the Topological Space for 
 supplied with
a compact-open topology is called a mapping space. 
See also Loop Space
References
Iyanaga, S. and Kawada, Y. (Eds.).  ``Mapping Spaces.''  §204B in
  Encyclopedic Dictionary of Mathematics.  Cambridge, MA: MIT Press, p. 658, 1980.