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21st February 2003, 12:08 PM  #1 
diyAudio Member
Join Date: Jan 2002
Location: Paris France

To NP, Aleph name , particle physics ?
Hi Nelson,
Slightly off topic but I was wondering if the name Aleph was coming from the detector in particle physics. Since you have a patent named supersymmetry, it would be a stange coincidence ... Akira 
21st February 2003, 12:17 PM  #2 
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Join Date: Jun 2002
Location: Singapore

Apparatus for LEP pHysics

21st February 2003, 12:26 PM  #3 
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Join Date: Dec 2002
Location: Milan, Italy

First letter of the Hebrew alphabet, I think...

21st February 2003, 12:33 PM  #4 
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Join Date: Sep 2002
Location: Sweden

No I rather think that Nelson is a mathematician or a theoretical
computer scientist. NP is one of the most important classes of computational problems, the problems that can be solved in nondeterministic polynomial time, and the hebrew letter aleph is used to denote cardinality of infinte sets: Aleph_0 is the cardinality of countable infinite sets like the integers and the rationals, Aleph_1 is the cardinality of the reals and then there is an infinite sequence of more and more infinite infinities. 
21st February 2003, 01:54 PM  #5 
diyAudio Member

aleph null
Alephnull is the cardinal number of the set of Integers. (There are as many positive integers as there are both positive and negative integers, and that is Alephnull. Alephnull plus alephnull equals alephnull.) http://www.bsu.edu/web/jcflowers1/rlo/mathnumbers.htm 
21st February 2003, 01:58 PM  #6  
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Join Date: Sep 2002
Location: Sweden

Quote:
So, change to Aleph_1 and Aleph_2, in my previous posting. 

21st February 2003, 04:50 PM  #8 
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Isn't that usually spelled alpha?
Tim 
21st February 2003, 05:13 PM  #9  
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Join Date: Aug 2002
Location: Toronto, Canada

Quote:
Mr. Pass as opposed to the complexity class. BTW, the cardinality of the reals is often denoted 'c' (continuum). The conjecture that c=Aleph_1 actually turned out to be one of the strangest problems in mathematical logic. (This is the socalled 'continuum hypothesis'.) Whether this is true of false (and here's the fun part) turned out to depend on whether you work in a logic system which includes something called the Axiom of Choice. Dennis 

21st February 2003, 05:20 PM  #10 
diyAudio Member

i have just done search in goggle and
http://www.moonromance.net/storyview.php?storyid=7193 check this one out
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Boleslaw Zaras 
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