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akshayms
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Homework Statement
Consider the following question
Adams is a boy who does not own a car. Mary dates only boys who own
cars.Therefore Mary does not date Adams.
Homework Equations
The Attempt at a Solution
My answer is like this...
Let Bx=x is a boy.
Ox=x owns car
Dxy=x Dates y
a=Adams
m=Mary
Accordingly we can translate sentences as
1)Ba&~Oa
2)for all x (Bx&Ox->Dmx)
-----------------------
2) can be written as Ba&Oa->Dma (by universal specification)
further 2 can be reduced to
3) Ba->(Oa->Dma) (By law of exportation)
4) Oa->Dma (from p->q and p so q)
5) ~Oa (From p&q so q)
So, "we can't conclude that Mary does not date Adams".
Am i wrong? If I'm please explian me where it went wrong. Thanks in advance.