@fast,
fast;135983 wrote:
I said, "the number three was around before people." I could have worded that better. What I mean to say is that the number three exists AND the existence of the number three is mind-independent.
One can acknowledge the existence of three without taking the further step of claiming it is mind-independent.
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The existence of humans is not a requirement for the existence of numbers. We did not invent numbers. We discovered numbers. We invented numerals, and numerals are referring terms, and numerals (what we invented) refer to numbers (what we discovered).
Obviously, we disagree on this. Humans invented the numbering system. They invented mathematics. Mathematical propositions are rules for the transformation of empirical propositions. Rules are not discovered, but invented.
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The answer is that the number three is the class of all triples. But, what in the heck is a triple? Think of a triple as the physical relationship between a group of three objects. For example, three people standing next to each other. Three trees clustered together. Isn't it so that the relationship between the sun and the other planets is such that Earth is the third from the sun? That physical relationship is fact, and it was a fact prior to our discovery.
I think we can agree that the planets existed long before humans did. After all, that is part of our conception of what a planet is: a physical substance that enjoys independent existence.
We could have chosen to number all planetary objects in pairs. That would mean that Mercury and Venus would be considered as one (the first pair), Earth and Mars as two (the second pair), etc. Although this sort of way of classifying the spatial relationships of the planets does not at first glance appear usefu, it is not too difficult to think of scenarios in which it could have arisen. Are you going to argue that this other way of classifying the planetary relationships also existed before humans were around?
Isn't classification arbitrary? We classify things accoring to our needs and interests.
---------- Post added 03-04-2010 at 11:36 AM ----------
fast;135983 wrote:
IThere are 1) referring terms and 2) non-referring terms. Some referring terms 1) successfully refer and some referring terms 2) fail to refer.
However, there is a difference between 1) a referring term that fails to refer and 2) a non-referring term.
"Goblin" is a referring term, but it fails to refer since there are no goblins. If we are mistaken and find that there are goblins, then "Goblin" will still be a referring term, but instead of it failing to refer, it will succeed at referring. Same with unicorns.
That is a stipulated use of the word "refer". It is part of a theory of how language should work.
Based on my understanding of English language and my observation of how others use it, I don't think most people would agree with that stipulation or even find it useful. Leastways, I don't ever recall being told in grammar school that I couldn't use words to refer to imaginary beings because those beings don't actually exist.