I came across this notation in a book titled "Combinatorial Optimization Theory and Algorithms" by Bernhard Korte and Jens Vygen.
2026-03-29 03:53:27.1774756407
If $G$ and $H$ are two graphs, then what does $G \Delta H$ indicate in graph theory?
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There is an index of notations in the book on page 573. If you look up "$\Delta$" in it, you see that this is the symmetric difference of sets: $$X \mathbin\Delta Y = (X \setminus Y) \cup (Y \setminus X).$$
It does not appear to be an operation on graphs, just on sets.