Boundary Operator
Each of the maps in a chain complex
| ...->C_(i+1)->^(d_(i+1))C_i->^(d_i)C_(i-1)->... |
is known as a boundary operator.
See also
Chain Complex, Coboundary OperatorThis entry contributed by Margherita Barile
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Barile, Margherita. "Boundary Operator." From MathWorld--A Wolfram Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/BoundaryOperator.html