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Old 2010-11-07, 23:02   #1
science_man_88
 
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Default basics of relativity

hi I've been talking to a few people to try to learn basics of relativity

http://en.wikipedia.org/wiki/General_relativity

http://www.4p8.com/eric.brasseur/erta.html

which is correct i can't see one that's the same even.

even the special relativity wikipedia doesn't agree I think

Last fiddled with by science_man_88 on 2010-11-07 at 23:13
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Old 2010-11-08, 01:13   #2
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guessing nobody cares ?
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Old 2010-11-08, 01:21   #3
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I, for one, don't understand what you're asking.
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Old 2010-11-08, 10:23   #4
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Quote:
Originally Posted by CRGreathouse View Post
I, for one, don't understand what you're asking.
[AOL]me too!!![/aol]

Paul
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Old 2010-11-08, 11:28   #5
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Me neither.

But one thing that Einstein/relativity did was to clarify
our thinking about geometry, time, kinematics and classical mechanics.

David

PS Pity Riemann died so young.

Last fiddled with by davieddy on 2010-11-08 at 11:29
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Old 2010-11-08, 12:36   #6
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Quote:
Originally Posted by CRGreathouse View Post
I, for one, don't understand what you're asking.

i'm not sure which is accurate equation wise as they have different equation between the 2 different site basically I'm asking for which is correct and maybe a little help understanding relativity.
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Old 2010-11-08, 14:06   #7
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Quote:
Originally Posted by xilman View Post
[AOL]me too!!![/aol]

Paul
He is on my ignore list, so I won't even try to guess what he asked.

I will off him some advice, however:

Don't Bother.

You lack the math background. You have no hope of learning
relativity with your present knowledge of mathematics.

To illustrate my point, I will ask two simple questions.

Do you know the difference between an affine linear transform and a
projective linear transform?

Do you know what a positive definite matrix is and can you explain why,
from a geometric point of view, it is different from matrices that are
NOT positive definite?

If you can't answer these two questions without looking up the answers
than you are not even ready to begin studying the necessary math
to understand relativity (esp. General Relativity; one needs to understand
tensors and differential geometry)
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Old 2010-11-08, 14:27   #8
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Quote:
Originally Posted by R.D. Silverman View Post
He is on my ignore list, so I won't even try to guess what he asked.

I will off him some advice, however:

Don't Bother.

You lack the math background. You have no hope of learning
relativity with your present knowledge of mathematics.

To illustrate my point, I will ask two simple questions.

Do you know the difference between an affine linear transform and a
projective linear transform?

Do you know what a positive definite matrix is and can you explain why,
from a geometric point of view, it is different from matrices that are
NOT positive definite?

If you can't answer these two questions without looking up the answers
than you are not even ready to begin studying the necessary math
to understand relativity (esp. General Relativity; one needs to understand
tensors and differential geometry)
Even by the standards of the RDS School of Diplomacy, this post
takes the biscuit

David
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Old 2010-11-08, 14:32   #9
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fine don't teach me I was trying to ask which is accurate as as far as i can tell they both can't be.
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Old 2010-11-08, 14:41   #10
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Quote:
Originally Posted by science_man_88 View Post
fine don't teach me I was trying to ask which is accurate as as far as i can tell they both can't be.
You may find people more helpful to you if you were more helpful yourself.

TBH, I can't be bothered chasing off to two different web sites to answer an ill-formed question from someone who doesn't even have the basic courtesy of presenting the material found to be confusing.

Post the equations and enough context and I may be able to help.

Paul
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Old 2010-11-08, 14:47   #11
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Quote:
Originally Posted by science_man_88 View Post
fine don't teach me I was trying to ask which is accurate as as far as i can tell they both can't be.
Are you referring to two conflicting formulae? If so, quote them.

BTW are you aware that simultanaity is not an absolute feature
of events in different places?

David

PS the CAPS or SHIFT key is on the left.
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