I have come across the notation $|A\Delta B|$ in a combinatoris course, but I am still not clear about what this means. The best I have found is here on page 2, from which I think $\Delta$ takes the set of all elements that are eithr in $A$ or $B$ but not the other?
2026-04-12 10:38:49.1775990329
Delta notation in combinatorics
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$A\Delta B = (A\setminus B)\cup (B\setminus A)$.