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Groups > sci.physics.relativity > #479427

Re: What is a field?

From benj <benj.fake@gmail.com>
Newsgroups sci.physics.relativity
Subject Re: What is a field?
Date 2018-12-08 23:44 -0500
Organization Aioe.org NNTP Server
Message-ID <pui6j3$1p9a$3@gioia.aioe.org> (permalink)
References (3 earlier) <d42c2e6f-218e-b6aa-e7fd-b703676902d6@PointedEars.de> <24aaf065-a933-4995-bb21-3e51cff08d82@googlegroups.com> <puhhc7$oa5$2@gioia.aioe.org> <9623308e-4788-4bca-8bbf-504974f13980@googlegroups.com> <puhmn1$11gj$1@gioia.aioe.org>

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On 12/8/2018 7:13 PM, Odd Bodkin wrote:
> kenseto <setoken@att.net> wrote:
>> On Saturday, December 8, 2018 at 5:42:19 PM UTC-5, Odd Bodkin wrote:
>>> kenseto <setoken@att.net> wrote:
>>>> On Saturday, December 8, 2018 at 2:09:37 PM UTC-5, Thomas 'PointedEars' Lahn wrote:
>>>>> kenseto wrote:
>>>>>> […] Thomas 'PointedEars' Lahn wrote:
>>>>>>> kenseto wrote:
>>>>>>>> According to Steven Weinberg: A field is a sort of stress in space,
>>>>>>>> something like the various sorts of stress that are possible within
>>>>>>>> a solid body.
>>>>>>>
>>>>>>> Where and when did he write/say this?
>>>>>>>
>>>>>>> IIRC, we have been over this here.
>>>>>>>
>>>>>>> A field in physics is simply an object in models where every point in a
>>>>>>> mathematical space is assigned a value:
>>>>>>
>>>>>> So Weinberg’s description that a field is the stress exists at every point
>>>>>> in a solid body is very close to the  correct description.
>>>>>
>>>>> No, it is not.  And probably you misquoted or misunderstood him.
>>>>>
>>>>>> In any case what is mathematical space?
>>>>>
>>>>> *A* mathematical space is (put simply) *an* abstract entity in which (a)
>>>>> coordinate(s) is/are assigned to each point.  And there are rules
>>>>> (operations) that define how you can get from one point to another, for example.
>>>>>
>>>>> (There is not *the* mathematical space.)
>>>>>
>>>>> The concept of a field uses this.  You can assign a value to every point in
>>>>> a mathematical space as described by its coordinates.  That value can be a
>>>>> number (scalar), perhaps with a unit; it can be a vector itself, or in
>>>>> general it can be a tensor.  (See below.)
>>>>>
>>>>> If the value is that of a *physical* quantity (like temperature, force,
>>>>> acceleration, or stress), then you can use this field to describe physical
>>>>> reality mathematically.  In the first example in my previous follow-up, the
>>>>> coordinate system was defined so that the heat source was in its origin
>>>>> because the temperature was highest there (note the peak); it became lower
>>>>> as the distance from the origin – given by √(x² + y²), according to the
>>>>> Pythagorean theorem – increased.
>>>>
>>>> This mathematical approach is devoting the physical explanation why
>>>> material objects interacting with each other at a distance. For example,
>>>> what is the physical cause of gravity....why object orbiting each other
>>>> without falling into each other?
>>>
>>> This is where even the simple ideas elude you. To you, an attractive force
>>> could only conceivably result in the two attracting objects approaching
>>> each other. To you, the idea of a stable circular orbit with no decrease in
>>> distance is impossible with an attractive force — it’s just inconceivable
>>> to you.
>>
>> Yes, a stable orbit with just an attractive force is not feasible....
> 
> Oh but it is. You just don’t understand how and that frustrates you.
> 
> When you don’t understand something, you invent something you do
> understand. But, as you can see from the lack of people downloading your
> book even though it’s FREE, nobody cares.

Hey, my book is free and nobody (especially you) cares. Most agree with 
you that it feels a lot more comfy to make an effort to stay ignorant 
and happy than to strain yourself thinking. Hence, it is always best to 
refuse to read any new ideas.


>> Newton’s formula includes centripetal acceleration and centrifugal
>> acceleration. For that matter action at a distance is not possible
>> without connection between the interacting objects.
>>
>>>
>>> I’ll point out this is is not a modern physics idea. It is a centuries-old
>>> HIGH SCHOOL physics idea.
>>>
>>> And your reaction is that if it makes no sense to you, then it must be
>>> wrong.
>>>
>>>>
>>>>
>>>>>
>>>>>> Is it not a solid body?
>>>>>
>>>>> Yes, a (mathematical) space is NOT a solid body.  It is an *abstract*
>>>>> *concept* instead.  It can be used, and is used, in physics, to describe
>>>>> Nature; but like other mathematical concepts, in mathematics it can also
>>>>> exist independently from Nature, and physics.
>>>>>
>>>>> A solid body can be described as being *in* a mathematical space.  That
>>>>> is, some points of the space lie inside the body and some outside of it.
>>>>> It is often useful to place the origin of the coordinate system in the
>>>>> center of the body, or in its center of mass.
>>>>>
>>>>> <http://www.cornell.edu/video/richard-feynman-messenger-lecture-2-relation-mathematics-physics>
>>>>>
>>>>>> If it is not a solid body how can material objects interact with the
>>>>>> stresses exist within it?
>>>>>
>>>>> Stress is not something that a (whole) solid body interacts with; it just
>>>>> is, *for* the body, caused by the particles of the body interacting *with
>>>>> each other*.
>>>>>
>>>>> Please trim your quotes to the relevant minimum; that includes the
>>>>> attribution line.
>>>>>
>>>>> -- 
>>>>> PointedEars
>>>>>
>>>>> Twitter: @PointedEars2
>>>>> Please do not cc me. / Bitte keine Kopien per E-Mail.
>>>>
>>>
>>>
>>>
>>> -- 
>>> Odd Bodkin — Maker of fine toys, tools, tables
>>
> 
> 
>

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Thread

What is a field? kenseto <setoken@att.net> - 2018-12-07 06:08 -0800
  Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-07 16:58 +0000
    Re: What is a field? paulcardinale0@gmail.com - 2018-12-07 11:58 -0800
    Re: What is a field? kenseto <setoken@att.net> - 2018-12-08 06:05 -0800
      Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-08 14:13 +0000
  Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-07 11:39 -0800
    Re: What is a field? kenseto <setoken@att.net> - 2018-12-08 06:28 -0800
      Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-08 15:35 +0000
        Re: What is a field? kenseto <setoken@att.net> - 2018-12-08 10:33 -0800
          Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-08 10:43 -0800
          Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-08 19:15 +0000
      Re: What is a field? moroney@world.std.spaamtrap.com (Michael Moroney) - 2018-12-08 17:52 +0000
        Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-08 18:21 +0000
        Re: What is a field? kenseto <setoken@att.net> - 2018-12-08 10:26 -0800
          Re: What is a field? moroney@world.std.spaamtrap.com (Michael Moroney) - 2018-12-08 18:37 +0000
          Re: What is a field? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-12-08 20:18 +0100
            Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-08 19:56 +0000
              Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-08 21:51 -0800
              Re: What is a field? kenseto <setoken@att.net> - 2018-12-09 08:20 -0800
                Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-09 12:44 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-09 22:20 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-10 08:04 -0800
                Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-10 10:31 -0800
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-10 13:33 -0800
                Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-10 13:53 -0800
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-11 06:16 -0800
                Re: What is a field? moroney@world.std.spaamtrap.com (Michael Moroney) - 2018-12-11 14:41 +0000
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-10 22:00 +0000
                Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-10 14:13 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-10 23:03 +0000
                Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-10 15:46 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-11 01:37 +0000
                Re: What is a field? Prokaryotic Caspase Homolog <prokaryotic.caspase.homolog@gmail.com> - 2018-12-10 16:26 -0800
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-11 07:32 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-12 13:53 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-13 07:27 -0800
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-11 07:27 -0800
                Re: What is a field? moroney@world.std.spaamtrap.com (Michael Moroney) - 2018-12-11 16:00 +0000
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-10 21:56 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-11 06:51 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-11 18:42 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-11 18:09 -0800
                Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-11 20:18 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-12 13:53 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-13 07:21 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-13 18:32 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-13 13:20 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-13 21:46 +0000
                Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-13 10:47 -0800
                Re: What is a field? moroney@world.std.spaamtrap.com (Michael Moroney) - 2018-12-14 05:35 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-14 15:13 -0800
                Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-14 15:22 -0800
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-15 14:05 -0800
                Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-15 23:27 -0800
                Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-12 13:04 -0500
            Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-08 23:30 -0500
            Re: What is a field? kenseto <setoken@att.net> - 2018-12-09 08:12 -0800
              Re: What is a field? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-12-09 17:19 +0100
          Re: What is a field? Rich Carpenter <lcug@kigcohc.pa> - 2018-12-09 00:32 +0000
      Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-08 10:42 -0800
        Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-08 19:15 +0000
          Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-08 23:29 -0500
            Re: What is a field? kenseto <setoken@att.net> - 2018-12-10 06:18 -0800
              Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-10 07:26 -0800
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-10 08:11 -0800
                Re: What is a field? moroney@world.std.spaamtrap.com (Michael Moroney) - 2018-12-10 17:07 +0000
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-10 22:00 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-11 07:14 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-11 18:42 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-12 04:56 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-12 13:53 +0000
        Re: What is a field? kenseto <setoken@att.net> - 2018-12-09 07:54 -0800
          Re: What is a field? kenseto <setoken@att.net> - 2018-12-09 07:58 -0800
          Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-09 22:20 +0000
            Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-12 13:00 -0500
              Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-12 18:14 +0000
                Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-13 10:59 -0500
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-13 08:51 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-13 18:32 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-13 13:23 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-13 21:46 +0000
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-13 23:36 +0000
                Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-13 20:06 -0500
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-14 12:21 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-14 15:16 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-15 02:14 +0000
                Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-13 19:53 -0500
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-14 12:21 +0000
              Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-12 10:38 -0800
  Re: What is a field? mitchrae3323@gmail.com - 2018-12-07 12:48 -0800
    Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-07 12:51 -0800
      Re: What is a field? "Ross A. Finlayson" <ross.finlayson@gmail.com> - 2018-12-08 12:22 -0800
        Re: What is a field? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-12-08 22:05 +0100
          Re: What is a field? "Ross A. Finlayson" <ross.finlayson@gmail.com> - 2018-12-08 16:24 -0800
        Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-08 23:46 -0500
          Re: What is a field? "Ross A. Finlayson" <ross.finlayson@gmail.com> - 2018-12-08 22:41 -0800
            Re: What is a field? "Ross A. Finlayson" <ross.finlayson@gmail.com> - 2018-12-09 14:08 -0800
              Re: What is a field? "Ross A. Finlayson" <ross.finlayson@gmail.com> - 2018-12-09 14:44 -0800
                Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-12 13:36 -0500
        Re: What is a field? JanPB <filmart@gmail.com> - 2018-12-08 21:56 -0800
          Re: What is a field? "Ross A. Finlayson" <ross.finlayson@gmail.com> - 2018-12-08 22:54 -0800
            Re: What is a field? "Ross A. Finlayson" <ross.finlayson@gmail.com> - 2018-12-08 23:22 -0800
              Re: What is a field? "Ross A. Finlayson" <ross.finlayson@gmail.com> - 2018-12-09 12:35 -0800
  Re: What is a field? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-12-07 22:01 +0100
    Re: What is a field? kenseto <setoken@att.net> - 2018-12-08 06:42 -0800
      Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-08 15:35 +0000
        Re: What is a field? kenseto <setoken@att.net> - 2018-12-08 10:21 -0800
          Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-08 19:15 +0000
            Re: What is a field? kenseto <setoken@att.net> - 2018-12-08 14:17 -0800
              Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-08 22:42 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-08 14:58 -0800
                Re: What is a field? moroney@world.std.spaamtrap.com (Michael Moroney) - 2018-12-09 01:22 +0000
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-09 13:07 +0000
            Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-08 23:26 -0500
              Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-09 13:07 +0000
        Re: What is a field? kenseto <setoken@att.net> - 2018-12-08 10:27 -0800
          Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-08 19:15 +0000
          Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-08 23:23 -0500
            Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-09 13:07 +0000
            Re: What is a field? kenseto <setoken@att.net> - 2018-12-09 14:19 -0800
              Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-09 22:25 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-10 07:54 -0800
                Re: What is a field? moroney@world.std.spaamtrap.com (Michael Moroney) - 2018-12-10 17:15 +0000
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-10 21:41 +0000
                Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-12 13:14 -0500
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-12 18:18 +0000
      Re: What is a field? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-12-08 20:09 +0100
        Re: What is a field? kenseto <setoken@att.net> - 2018-12-08 14:28 -0800
          Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-08 22:42 +0000
            Re: What is a field? kenseto <setoken@att.net> - 2018-12-08 14:56 -0800
              Re: What is a field? Dirk Van de moortel <dirkvandemoortel@notmail.com> - 2018-12-09 00:06 +0100
              Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-09 00:13 +0000
                Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-08 23:44 -0500
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-09 09:19 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-09 22:22 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-10 07:50 -0800
                Re: What is a field? moroney@world.std.spaamtrap.com (Michael Moroney) - 2018-12-10 17:09 +0000
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-10 21:41 +0000
            Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-08 23:37 -0500
              Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-09 13:07 +0000
            Re: What is a field? kenseto <setoken@att.net> - 2018-12-09 08:40 -0800
              Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-09 22:22 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-10 08:07 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-10 21:56 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-11 07:07 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-11 18:42 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-11 18:19 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-12 13:53 +0000
                Re: What is a field? kenseto <setoken@att.net> - 2018-12-13 07:54 -0800
                Re: What is a field? Odd Bodkin <bodkinodd@gmail.com> - 2018-12-13 18:32 +0000
          Re: What is a field? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-12-09 01:24 +0100
            Re: What is a field? benj <benj.fake@gmail.com> - 2018-12-08 23:42 -0500
            Re: What is a field? kenseto <setoken@att.net> - 2018-12-09 10:08 -0800
              Re: What is a field? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-12-09 19:36 +0100
        Re: What is a field? kenseto <setoken@att.net> - 2018-12-08 14:43 -0800
          Re: What is a field? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-12-09 11:51 +0100
  Re: What is a field? carleto4157990662@gmail.com - 2018-12-07 13:42 -0800
  Re: What is a field? "Chris M. Thomasson" <invalid_chris_thomasson@invalid.invalid> - 2018-12-15 19:51 -0800

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