Re:How can anything be infinitely small?

From	Libor Striz <poutnik4REMOVEnntp@CAPITALSgmail.com>
Newsgroups	sci.physics
Subject	Re:How can anything be infinitely small?
Date	2018-10-05 08:39 +0200
Organization	news.eternal-september.org
Message-ID	<pp70um$bss$1@dont-email.me> (permalink)
References	<8a23d180-ed34-4274-ab04-7beb8cc57197@googlegroups.com>

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alal65536@gmail.com Wrote in message:
> I was watching a quality documentary on the Big Bang.  Somebody mentioned that the universe was infinitely small.  Can anything be smaller than Planck length?  I also don’t like the use of the word, infinity, used to describe something real.  While there may be infinities or infinitesimals in theory, I do not think anything real can be as such in practise.

There is need to distinguish mathematical and physical infinity.
A physical infinity is not a true mathematical infinity.

(Mathematical) infinities are bigger or smaller than any finite
 (nonzero) values. 

For physics, it means bigger or smaller than any finite (nonzero)
 *measureable* values.

In context of physics, an infinity is such a small or big value,
 where the difference wrt true infinity is negligible in context 
 of considered theory, known or measured values or observed or
 vonsidered phenomena.

E.g. an electron is for physics infinitely small, as it is
 experimentally smaller then any measurable size.

A photon  mass is for physics infinitely small, as it is
 experimentally smaller then any measurable mass.

-- 
Libor Striz aka Poutnik ( a pilgrim/wanderer/wayfarer)

"Humour is the only effective weapon against stupidity."
Miloš Forman


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Thread

How can anything be infinitely small? alal65536@gmail.com - 2018-10-03 13:53 -0700
  Re: How can anything be infinitely small? mitchrae3323@gmail.com - 2018-10-04 10:31 -0700
    Re: How can anything be infinitely small? Sergio <invalid@invalid.com> - 2018-10-04 12:50 -0500
      Re: How can anything be infinitely small? Double-A <double-a3@hush.com> - 2018-10-04 14:13 -0700
        Re: How can anything be infinitely small? "Chris M. Thomasson" <invalid_chris_thomasson@invalid.invalid> - 2018-10-04 14:52 -0700
          Re: How can anything be infinitely small? Double-A <double-a3@hush.com> - 2018-10-04 16:24 -0700
            Re: How can anything be infinitely small? Sergio <invalid@invalid.com> - 2018-10-04 20:53 -0500
              Re: How can anything be infinitely small? "Chris M. Thomasson" <invalid_chris_thomasson@invalid.invalid> - 2018-10-04 21:35 -0700
            Re: How can anything be infinitely small? "Chris M. Thomasson" <invalid_chris_thomasson@invalid.invalid> - 2018-10-04 21:42 -0700
      Re: How can anything be infinitely small? mitchrae3323@gmail.com - 2018-10-04 18:44 -0700
        Re: How can anything be infinitely small? "Chris M. Thomasson" <invalid_chris_thomasson@invalid.invalid> - 2018-10-05 21:32 -0700
          Re: How can anything be infinitely small? mitchrae3323@gmail.com - 2018-10-05 22:50 -0700
            Re: How can anything be infinitely small? "Chris M. Thomasson" <invalid_chris_thomasson@invalid.invalid> - 2018-10-05 23:14 -0700
    Re: How can anything be infinitely small? poraty149@gmail.com - 2018-10-04 20:37 -0700
    Re: How can anything be infinitely small? "reber G=emc^2" <herbertglazier0@gmail.com> - 2018-10-05 12:43 -0700
  Re: How can anything be infinitely small? Sylvia Else <sylvia@email.invalid> - 2018-10-05 12:14 +1000
    Re: How can anything be infinitely small? Edward Prochak <edprochak@gmail.com> - 2018-10-05 09:05 -0700
      Re: How can anything be infinitely small? benj <benj.fake@gmail.com> - 2018-10-05 17:00 -0400
        Re: How can anything be infinitely small? Edward Prochak <edprochak@gmail.com> - 2018-10-08 07:37 -0700
          Re: How can anything be infinitely small? benj <benj.fake@gmail.com> - 2018-10-08 11:57 -0400
  Re:How can anything be infinitely small? Libor Striz <poutnik4REMOVEnntp@CAPITALSgmail.com> - 2018-10-05 08:39 +0200
    Re:How can anything be infinitely small? john <johnsefton288@gmail.com> - 2018-10-05 07:01 -0700
      Re:How can anything be infinitely small? Libor Striz <poutnik4REMOVEnntp@CAPITALSgmail.com> - 2018-10-05 16:39 +0200
        Re:How can anything be infinitely small? john <johnsefton288@gmail.com> - 2018-10-05 07:52 -0700
          Re:How can anything be infinitely small? Libor Striz <poutnik4REMOVEnntp@CAPITALSgmail.com> - 2018-10-05 17:02 +0200
            Re: How can anything be infinitely small? benj <benj.fake@gmail.com> - 2018-10-05 11:22 -0400
              Re: How can anything be infinitely small? Libor Striz <poutnik4REMOVEnntp@CAPITALSgmail.com> - 2018-10-05 18:41 +0200
                Re: How can anything be infinitely small? benj <benj.fake@gmail.com> - 2018-10-05 17:11 -0400
        Re: How can anything be infinitely small? benj <benj.fake@gmail.com> - 2018-10-05 11:16 -0400
          Re: How can anything be infinitely small? Edward Prochak <edprochak@gmail.com> - 2018-10-05 09:12 -0700
          Re: How can anything be infinitely small? Libor Striz <poutnik4REMOVEnntp@CAPITALSgmail.com> - 2018-10-05 18:43 +0200
            Re: How can anything be infinitely small? benj <benj.fake@gmail.com> - 2018-10-05 17:14 -0400
        Re: How can anything be infinitely small? poraty149@gmail.com - 2018-10-05 23:20 -0700
          Re: How can anything be infinitely small? "reber G=emc^2" <herbertglazier0@gmail.com> - 2018-10-10 13:05 -0700
            Re: How can anything be infinitely small? mitchrae3323@gmail.com - 2018-10-10 20:13 -0700
              Re: How can anything be infinitely small? "Chris M. Thomasson" <invalid_chris_thomasson@invalid.invalid> - 2018-10-10 20:14 -0700
                Re: How can anything be infinitely small? benj <benj.fake@gmail.com> - 2018-10-10 23:53 -0400
  Re: How can anything be infinitely small? Edward Prochak <edprochak@gmail.com> - 2018-10-05 08:59 -0700
    Re: How can anything be infinitely small? benj <benj.fake@gmail.com> - 2018-10-05 16:48 -0400

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