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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 diyAudio Member     Join Date: Jun 2002 Location: Singapore Apparatus for LEP pHysics
 21st February 2003, 12:26 PM #3 diyAudio Member   Join Date: Dec 2002 Location: Milan, Italy First letter of the Hebrew alphabet, I think...
 21st February 2003, 12:33 PM #4 diyAudio Member   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 non-deterministic 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     Join Date: Oct 2000 Location: PA, USA Blog Entries: 1 aleph null Aleph-null 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 Aleph-null. Aleph-null plus aleph-null equals aleph-null.) http://www.bsu.edu/web/jcflowers1/rlo/mathnumbers.htm
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Join Date: Sep 2002
Location: Sweden
Quote:
 Originally posted by vdi_nenna aleph null 0 with a / through it.
You're probably right. It's a long time since I took discrete math.
So, change to Aleph_1 and Aleph_2, in my previous posting.

 21st February 2003, 02:02 PM #7 diyAudio Member     Join Date: Oct 2000 Location: PA, USA Blog Entries: 1 I'm no math wiz. I remember it from some math class and always thought it sounded cool. Cool name for a band maybe...
 21st February 2003, 04:50 PM #8 diyAudio Member     Join Date: Jan 2003 Location: Milwaukee, WI Isn't that usually spelled alpha? Tim
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Join Date: Aug 2002
Quote:
 Originally posted by Christer 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 non-deterministic 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.
After hanging around here a while, I now think of NP as initials for
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 so-called '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     Join Date: Dec 2002 Location: Poland, Cieszyn i have just done search in goggle and http://www.moonromance.net/storyview.php?storyid=7193 check this one out __________________ Boleslaw Zaras

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