[Haskell-cafe] Propositional logic question

[Jeff Polakow]

Hello,

> But here I am only entitled to discharge (A /\ B) in the preceding
> proof and not A and B on their own.
> What proof which would allow me to discharge my assumptions A and B?
> 
> I can see in my head how it makes perfect sense, but can't jiggle a
> way to do it using only the given derivations.
> 
You have (A /\ B) to work with. Remember that intuitionistic/classical 
logic places no restrictions on how many times you use each hypothesis.

hth,
  Jeff


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