Closed fifofefe closed 6 years ago
P (+ A B) = x\y\ (exist x'. exisst y'\ x = inl x' and y = inl y' _and P A x' y' ) or (exist x'. exisst y'\ x = inr x' and y = inr y' _and P B x' y' )
P (+ A B) = x\y\ (exist x'. exisst y'\ x = inl x' and y = inl y' _and P A x' y' ) or (exist x'. exisst y'\ x = inr x' and y = inr y' _and P B x' y' )