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Subject: Re: The problem with big-O is one of definitions

Author: Dann Corbit

Date: 10:33:56 05/10/01

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On May 10, 2001 at 06:06:48, Ralf Elvsén wrote:

>On May 09, 2001 at 20:37:06, Dann Corbit wrote:
>
>>
>>There are an estimated 10^82nd elementary particles in the universe.
>>
>This is news to me. Can you give a reference?

It's a commonly cited number.  For instance:
http://iroi.seu.edu.cn/books/whatis/googol.htm

Of course, if you buy into string theory (I don't) then there are an infinite
number of them.

It's obviously a broad guess.  You could also make a quick calculation based on
the mass of the universe.  Since it's almost all hydrogen, you could just find
the mass, calculate the moles of hydrogen, and multiply by two particles per
atom.  The number would be a bit low, but not more than a few percent [iff the
mass estimate were correct].



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