From Lewis Carroll’s first textbook in symbolic logic:
- No kitten that loves fish is unteachable.
- No kitten without a tail will play with a gorilla.
- Kittens with whiskers always love fish.
- No teachable kitten has green eyes.
- No kittens have tails unless they have whiskers.
What conclusion can be drawn from these premises?
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No kitten with green eyes will play with a gorilla.
Here’s another one, of a rather urgent character:
- There is no box of mine in this room that I dare open.
- My writing-desk is made of rose-wood.
- All my boxes are painted, except those in this room.
- There is no box of mine that I dare not open, unless it is full of live scorpions.
- All my rose-wood boxes are unpainted.
I’ll withhold the answer. Be careful!
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