For a sheaf 
on a topological space 
and an open set 
, a sheaf section over 
is an element 
. If 
is open, the restriction
map sends 
to its restriction 
.
A section over all of 
is called a global section, while a section over an open subset is called a local
section.
Sheaf Section
See also
Presheaf, Restriction Map, Sheaf, StalkExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Sheaf Section." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/SheafSection.html