So i thought, who could answer this question? This led me to the stephen fry forums. As we all know, if Stephen Fry said it, it must be true.
Anywho, i was in philosophy, studying necessary and sufficient conditions, when i came upon a poser: what, are the necessary conditions for a chair?
For anyone who does not know what these terms mean, they are defined as:
o A sufficient condition is something that is always true of something. EG: being a terrier is a suffient condition of being a dog. That is to say, one cannot be a terrier without being a dog. One can however be a dog without being a terrier.
o A necessary condition is a condition of something that without which something cannot be the case. EG: having canine DNA is a necessary condition for being a dog. One cannot be a dog, if one does not have canine DNA. However, one can have canine DNA without being a dog.
On to the question at hand: What are the necessary conditions of a chair? I have considered a few options but each have flaws:
o It has to have four legs... but a stool can have 3 legs, and still be a kind of chair, or even a rocking chair has no legs at all, and yet is still a chair.
o It has to be elevated... but if one digs a hole in the ground, and shapes it into a chair, it is not elevated, and still considered a chair.
o It has to be built for the purpose of being sat upon, and yet a ledge in a rock could (perhaps? or maybe not) be considered a chair. Even so, there are chairs made purely for show, and not to be sat on, and yet they are still chairs.
So, any ideas?
Edit: thanks for the help, and btw, there is a prize of chocolate in it for me if i can find an answer