Re: Division by zero

Liste des GroupesRevenir à sp relativity 
Sujet : Re: Division by zero
De : relativity (at) *nospam* paulba.no (Paul.B.Andersen)
Groupes : sci.physics.relativity
Date : 03. Feb 2025, 12:27:30
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <vnq91k$1816p$1@dont-email.me>
References : 1 2 3 4
User-Agent : Mozilla Thunderbird
Den 02.02.2025 10:40, skrev Mikko:
On 2025-02-02 06:58:32 +0000, Thomas Heger said:
 
Am Sonntag000002, 02.02.2025 um 03:19 schrieb Ross Finlayson:
On 02/01/2025 01:36 AM, Mikko wrote:
On 2025-02-01 08:14:08 +0000, Thomas Heger said:
>
Hi NG
>
I'm actually not really certain, but found an error in Einstein's 'On
the electrodynamics of moving bodies' which is quite serious.
>
>
See page six, roughly in the middle:
>
There we find an equation, which says this:
>
∂τ/∂y= 0
>
Do you mean on page 899 (9th page of the article) in §3?
The operation is not division but a partial derivative.
>
Now, 'tau' is a time belonging to the moving system k.
>
Yes, but it is also a number that is computed from coordinates of K.
>
This system k moves along the x-axis of system K with velocity v,
while x- and xsi-axis coincide and etha- and y axis remain parallel.
>
In other words v_y is permanently zero,
>
Yes,
>
 or: ∂y=0.
>
No. ∂y is not a number but a part of an operator. There are points with
different values of y and ∂/∂y refers to a line where t, x, and z (but not
y) have the same value at every point.
>
See https://en.wikipedia.org/wiki/Partial_derivative
 Did you read https://en.wikipedia.org/wiki/Partial_derivative ?
 
Thomas Heger wouldn't understand it if he tried to read it.
Back in 2020 I tried to explain this equation:
(from the same page as the above)
  1/2*[ tau(0,0,0,t) + tau(0,0,0,t+ x'/(c-v)+x'/(c+v)) ]
   = tau ( x',0,0,t+x'/(c-v))
Thomas idea was that:  1/2*tau(0,0,0,t) = tau(0,0,0,t/2)
So I defined a simpler function and wrote
a simpler equation:
|Den 23.03.2020 17:41, skrev Thomas Heger:
|> Am 23.03.2020 um 10:10 schrieb Paul B. Andersen:
|>>
|>> Given the linear function f(x',t) = x'+2t
|>>
|>>  0.5*[f(0,1)+f(0,2)] = f(1,1)    (3 = 3)
|>>
|>>  0.5*[f(0,k)+f(0,2k)] = f(k,k)   (3k = 3k)
|>>
|>>  0.5*[2+4] = 3      [1+2] = 3
|>>  0.5*[2k+4k] = 3k   [1k+2k] = 3k
|> no
|>
|> 1/2 * f(0,1) = f(0*x', 1/2*1*t) = f(0,1/2*t)= 1/2*t
|> + 1/2 * f(0,2)= f(0, t)=t
|> ------------------------
|> = 0.5*[f(0,1)+f(0,2)] = f(0, 1.5 *t)=1.5*t
|>
|>
|> TH
Thomas Heger seems incapable to learn, so he probably still don't
know what a function is.
--
Paul
https://paulba.no/

Date Sujet#  Auteur
1 Feb 25 * Division by zero28Thomas Heger
1 Feb 25 +* Re: Division by zero24Mikko
2 Feb 25 i+* Re: Division by zero5Ross Finlayson
2 Feb 25 ii`* Re: Division by zero4Thomas Heger
2 Feb 25 ii +* Re: Division by zero2Mikko
3 Feb 25 ii i`- Re: Division by zero1Paul.B.Andersen
2 Feb 25 ii `- Re: Division by zero (0, 1, infinity)1Ross Finlayson
2 Feb 25 i`* Re: Division by zero18Thomas Heger
2 Feb 25 i +* Re: Division by zero7Thomas Heger
2 Feb 25 i i`* Re: Division by zero6Mikko
3 Feb 25 i i `* Re: Division by zero5Thomas Heger
3 Feb 25 i i  `* Re: Division by zero4Mikko
4 Feb 25 i i   `* Re: Division by zero3Thomas Heger
5 Feb 25 i i    `* Re: Division by zero2Mikko
5 Feb 25 i i     `- Re: Division by zero1Thomas Heger
2 Feb 25 i `* Re: Division by zero10Mikko
3 Feb 25 i  `* Re: Division by zero9Thomas Heger
3 Feb 25 i   +* Re: Division by zero2Athel Cornish-Bowden
3 Feb 25 i   i`- Re: Division by zero1Thomas Heger
3 Feb 25 i   `* Re: Division by zero6Mikko
3 Feb 25 i    +- Re: Division by zero1Maciej Wozniak
4 Feb 25 i    `* Re: Division by zero4Thomas Heger
4 Feb 25 i     `* Re: Division by zero3Mikko
4 Feb 25 i      +- Re: Division by zero1Maciej Wozniak
5 Feb 25 i      `- Re: Division by zero1Thomas Heger
1 Feb 25 +* Re: Division by zero2J. J. Lodder
2 Feb 25 i`- Re: Division by zero1Ross Finlayson
20 Feb 25 `- Re: Division by zero1JanPB

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