Estocavio said:
Humanity1 said:
Estocavio said:
There are literally billions of people - So unique is impossible.
Rare? Certainly
Even 6.5 billion is a pretty tiny number when it comes to the realms of probability. An easy way to be unique would be to shuffle a standard deck of cards (sans jokers) and read out loud the order the cards are currently in. Overall there's a little over 8.0568*10^67 ways the deck can be arranged. Even if 6.5 billion people did this once a second for 6.5 billion years, they'd only go through 2.04984*10^14 decks, less than 1/10^50 of the total number of decks.
To put that number into perspective, if we had a spherical volume of space with a radius of 5 light years 1/10^50 of this area would be just 1m^3.
Yes, now if two people actually did that, the action iself would not be unique

But the real question is, can you think of something which there is no vague possibility of anyone in the whole world doing, with the exception of one person?
This is quite an interesting conversation
Yes, the action itself wouldn't, but the string of characters rattled off (the result) most likely would be. The chances of anyone having spoken the exact same sequence of syllables at any point since playing cards were invented to now (or even billions of years into the future, assuming we're still using playing cards) is tiny, like your much more likely to find a needle in a haystack tiny. With such a small probability of happening you can predict with a huge level of accuracy (practically 100%) that it hasn't happened yet. A 95% level of significance is sufficient for most scientists and statisticians when they are preforming experiments, 99% is ridiculously good. In this example I would be prepared to bet everything I own that if you shuffled a deck well and got everyone else on this planet to do the same, no one would have the same result as you.
I suppose the real question comes down to what are we considering to be unique? One extreme way of viewing unique is that is mush be a combination of different things that has never been combined that way before (eg. a person with brown hair would not be considered unique but someone with brown hair AND blue eyes AND who can play the trumpet AND who owns 3 pet vipers AND ... would be considered unique). The very extreme edge of this definition means that even a person with brown hair is unique as the particular arrangement of his brown hairs has most likely never been seen before which infers that, by this definition, everything can be described as unique, rendering it useless.
The other extreme is that, for something to be unique the entirity of what is being described as unique must have never been in existance before (eg. the person in the last example would not be unique in this definition if each element of his uniqueness was shared with at least one other person, which is quite likely). This means no physical attribute could be described as unique as all is made of electrons, protons etc. and in my card example no deck could be considered unique (even read out loud) as the elements of that deck (the cards) have all been read out/ listed/ existed before. As by this definition nothing is unique it's also pretty useless.
A good definition of unique falls somewhere in between these two extremes. My defintion leans towards the first in that anything that consists of atributes that have never been arranged or combined in a particular manner before is unique. Hence I'd say a well shuffled deck is almost certainly unique. By the sounds of things you lean more towards the second definition.
On a side note though, if we assume an infinite universe with infinitetime, although something may be unique at a particular time (eg. now) it can not be unique forever. In fact everything will eventually be repeated an infinite number of times (no matter what your definition of unique). Hence I think the term unique should only apply from the start of time to now, otherwise it has no meaning either.
Food for thought
