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Name: existing
Status: N/A
Age: N/A
Location: N/A
Country: N/A
Date: Around 1995


Question:
I was wondering if there is any literature on this space that I am thinking about. Suppose that for each prime number I create an axis. The value on an axis is a non-negative integer. A point in the space represents a number determined by the coordinates of the point. For example the number 1 would be 0, 0, . . . or 2^0 * 3^0 * 5^0 . . .)

And so 6 would be represented as
(1, 1, 0, 0, . . . or 2^1 * 3^1 * 5^0 * 7^0 . . .)

Is this idea of any use other than something fun to think about?


Replies:
What you are really describing is an infinite dimensional hyper-cubic unit lattice. The lattice points correspond to the natural numbers. The projection of a lattice point onto an axis tells you the number of times the prime represented by that axis divides the number represented by the lattice point. Primes correspond to lattice points that have a single 1 in their coordinates. The weird thing is (if this is all correct) is that the cardinality of the lattice points has to be the same as the natural numbers, i.e., Aleph nought!

hawley


Well, John's comment on cardinality is true only if you allow only finitely many of the integers in the lattice points to be non-zero. I assume the cardinality of the whole thing is essentially the same as the real numbers, if you do allow infinitely many non-zero integers (but any time you have infinitely many of non-zeroes, you no longer are representing a natural number - the product you get is infinite!) Anyway, it is certainly a cute idea. Note that you get all the rationals by allowing negative coefficients (all the positive rationals, that is), and there is actually a unique mapping of each rational number into this space (and it is 1 to 1, if we leave out the infinite non-zero sequences). Maybe somebody more well-versed in number theory will tell us all the results derived this way.

asmith


One question is: "What advantage can you get from this representation?" I would guess that there is certainly no geometric advantage for visualization be cause of the infinite number of axes. We are dealing with infinite sequences of integers so they can be added vector style and one can form integer scalar multiples of the "vectors." Addition should be the same as multiplication of the integers represented and scalar multiples should correspond to powers. We do not have a vector space because the scalars must be integral, but maybe an R-Module?

chaffer



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