P: X → BP: not A → not BP: ?C: not D → A

cshel September 14, 2017

Confused

Still a little confused as to why it's Not X -> D rather than Not D -> X

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cshel September 14, 2017

Oops. I meant to ask why it's

Not X -> D instead of

D -> not X

DRlsat7 December 15, 2020

agree I want this answered too.