Ah, right, "at least one". Brain fart. On Saturday, November 4, 2017 at 9:19:52 AM UTC-5, Jed Carty wrote: > > It is not just the intersection, for filters you just put one operand > after the other for an intersection [tag[A]tag[B]] is the intersection of > tiddlers with tag A and tiddlers with tag B. > > In set theory notation, the three operations are > > contains: A ⊆ B (A is a subset of B) > match: A ⊆ B and B ⊆ A (A is a subset of B and B is a subset of A) > overlap: A [image: \cap \!\,] B [image: \neq] [image: \varnothing \!\,] (The > intersection of A and B is not the empty set) >
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