CaptainQuasar
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Pythagorean said:I think we agree here? Unless you're being sarcastic over the internet. Which is fail.
I am being sarcastic. Fantastic thing, the internet, it can even transmit such noumenal things as sarcasm. Do you consider your thumb, or all thumbs, to be invented? To me, saying “mathematics is invented” is the same thing as saying “thumbs are invented”.
Pythagorean said:Perhaps you're still misunderstanding me. I don't think my understanding of inifnite is poor as a person, I think you me, and everyone have a poor understanding of infinite, and to some extent it's up to our imagination to understand it conceptually. I mean this in comparison to things we can tangibly relate too.
I think that you are extending the various concepts of infinite as used in mathematics to some more quintessential over-arching infinity. Such a thing might or might not exist but it isn't directly equivalent to the usage of infinite in mathematics, nor do the concepts of infinity in mathematics depend on a greater philosophical or existential concept of infinity.
Pythagorean said:I'm in my last year of physics classes, but I'm thinking of going back and double-majoring in math too. I have definitely seen the Taylor series... of course... truncated... so that it's exactly back to what I was saying before (because you'd never solve a problem if you didn't truncate, obviously).
But the reason that π is equal to
4 \sum_{n=0}^\infty \frac{(-1)^n}{2n + 1}
is not because humans have a need to solve problems. The need to solve problems is what motivated us to discover it, perhaps, but it is true independent of whether humans solve problems with it or not. And if human civilization and knowledge of mathematics was wiped out and all knowledge of the above equality was lost it would be possible for it to be re-discovered because its existence is independent of human invention.
Pythagorean said:Once we truncate, we're back to the same discussion of approximation. If you don't truncate, and you actually want to know real values for a real system, then you're going to be calculating for a long time (infinite time, I'd assume).
Of course, there are special cases, like geometric series where we know that infinite sum results in a finite number, but it's not like we actually go out to infinite with the index; we derive a shortcut formula. My point is that we never actually experience infinite.
I guess it's just that I would say that most of our experiences are infinite already. I think that what you're regarding as infinite is specifically something like an infinite expanse of space or an infinite length of time. Which I would agree can't be experienced.
But anyways, whether or not we can experience infinity doesn't determine whether it's something we invented or is a property of things in the real world external to humans.
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