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Article #2070

Re: Cryptography and P=NP

#2070
From: Robert Marti
Date: Sat, 21 Nov 1992 16:25
29 lines
1779 bytes
In article <722206613@pike.cs.duke.edu> srt@duke.cs.duke.edu
(Stephen R. Tate) writes:
> Huh?  I can think of very, very few algorithms (programs) that can not
> be counted on to halt.

Really?  Well, since "very, very few" is a somewhat ill defined concept
in mathematics, I can't even disagree with you.  Do you mean
- "there are fewer than M algorithms (programs) that cannot be counted
  on to halt" or
- "there is a possibly infinite but countable number of algorithms
  (programs) that cannot be counted on to halt" or ... ?



> To re-iterate:  programs that cannot be counted on to halt are very,
> very, very rare.  Most people will never see one.

I not only have seen one, I even have written one, albeit unintentionally.
By the above statement, this probably makes my a special person in some
sense -- if only especially stupid, maybe ;-)   (Then again, I seem
to recall other people telling me that they found out that they had
an endless loop in their program.  Oh, well ... )


-- 
Robert Marti                    |  Phone:    +41 1 254 72 60
Informationssysteme             |  FAX:      +41 1 262 39 73
ETH-Zentrum                     |  E-Mail:   marti@inf.ethz.ch
CH-8092 Zurich, Switzerland     |
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Path: arc1-ca.pugleaf.net!sparky!uunet!news.univie.ac.at!chx400!bernina!neptune!marti
References: <1992Nov19.172719.1540@fid.morgan.com> <1992Nov19.193036.26711@rchland.ibm.com> <722206613@pike.cs.duke.edu>

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From: marti@inf.ethz.ch (Robert Marti)
Subject: Re: Cryptography and P=NP
Message-ID: <1992Nov21.162515.21287@neptune.inf.ethz.ch>
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References: <1992Nov19.172719.1540@fid.morgan.com> <1992Nov19.193036.26711@rchland.ibm.com> <722206613@pike.cs.duke.edu>
Date: Sat, 21 Nov 1992 16:25:15 GMT
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