This has been bugging me midly for a while, but I couldn't figure out what the
Fr symbol in df-fr stood for:
19201 df-fr $a |- ( R Fr A <-> A. x ( ( x C_ A /\ x =/= (/) ) -> E. y e. x
A. z e. x -. z R y ) ) $.
I finally bothered to look up the Takeuti and Zaring reference, which also uses
"Fr" and calls R a "foundational relation". It's not super important, but would
it be worth mentioning this in df-fr's comment?
Cheers,
B. Wilson
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