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when toggle format what by license comment
Jun 22, 2016 at 8:24 history edited Włodzimierz Holsztyński CC BY-SA 3.0
a missing subphrase
Jun 22, 2016 at 8:22 comment added Włodzimierz Holsztyński @MarkGrant, I guess. Perhaps something like implies (not in the logical boolean sense but induces) can be even more like this.
Jun 22, 2016 at 8:12 comment added Mark Grant I think this is essentially contained in Alex Suciu's answer (he use the notation $F_2(X)$ for the deleted square).
Jun 22, 2016 at 3:00 history answered Włodzimierz Holsztyński CC BY-SA 3.0