Darren Duncan wrote:
Note that SQL's "in" I believe corresponds to the T/R version if I'm not mistaken.

Er, actually, that doesn't matter because usually SQL's "in" is used in a where clause, and hence the canonical way to do what we want in Muldis D isn't a membership test at all, but rather using the semijoin ("matching"|⋉) operator which takes a relation for both of its arguments.

-- Darren Duncan
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