srn347 comments on Standard and Nonstandard Numbers - Less Wrong
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Comments (83)
Actually, a binary relation is a binary operation (it returns 1 if true and 0 if false). You passed up a chance to counter-nitpick the nitpicker.
Yes, if you want a two-sorted theory, then you can make a boolean type and lift all relations to operations.
That's not the typical use of the word "operation" in model theory, however.