----- Original Message ----
> From: Stephen A. Lawrence <[email protected]>
> To: [email protected]
> Sent: Thu, April 1, 2010 5:55:08 PM
> Subject: Re: [Vo]:checking my understanding of Lorentz contraction
> 
> 

On 04/01/2010 05:31 PM, Harry Veeder wrote:
> 
> 
> 
> 
> 
> ----- Original Message ----
>> From: Stephen A. 
> Lawrence <
> href="mailto:[email protected]";>[email protected]>
>> To: 
> ymailto="mailto:[email protected]"; 
> href="mailto:[email protected]";>[email protected]
>> Sent: Thu, 
> April 1, 2010 4:01:43 PM
>> Subject: Re: [Vo]:checking my understanding 
> of Lorentz contraction
>>
>>
> 
> On 04/01/2010 
> 03:51 PM, Harry Veeder wrote:
>>

>> ----- Original Message 
> ----
>>> From: Stephen A. 
>> Lawrence <

> 
> 
>> Gravitational time dilation can be predicted from an argument 
> based
>> on conservation of energy and the interconvertibility of mass 
> and
>> energy, as I showed in an earlier post. And it doesn't depend 
> in
>> any way on variations in the strength of the gravitational 
> field.
> 
> 
> how can you have GP without an GF?

I 
> never said, or implied, that you could.

As I just said, in the text you 
> were responding to, this time with added
emphasis:

>> it doesn't 
> depend in any way on *variations* in the *strength*
>> of the 
> gravitational field.

To paraphrase:

The **VARIATIONS** in the 
> field STRENGTH are not relevant to
gravitational time dilation.

I 
> never said you didn't need to have a FIELD!


Only if potentials exist without fields, can it be said that time dilation 
"doesn't depend in any way on *variations* in the *strength*  of the 
gravitational field."

Harry


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