Branch
In complex analysis, a branch (also called a sheet) is a portion of the range of a multivalued function over which the function is single-valued. Combining all the sheets gives the full structure of the function. It is often convenient to choose a particular branch of a function to work with, and this choice is often designated the "principal branch" (or "principal sheet").
In graph theory, a branch at a point 
in a tree
is a maximal subtree containing 
as an endpoint
(Harary 1994, p. 35).
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10 by 10 addition table
