Geometric and arithmetic means and contraction factor

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SUMMARY

The relativistic contraction factor, denoted as ##\gamma##, is mathematically represented as the ratio of the geometric mean to the arithmetic mean of the terms ##C+v## and ##C-v##. However, while this mathematical representation is valid, it lacks physical insight into the phenomenon of relativistic contraction. Understanding that ##\gamma = \cosh\psi##, where ##\psi## is the rapidity, is more beneficial for practical applications in special relativity (SR). The discussion emphasizes the distinction between mathematical identities and their physical interpretations.

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  • Understanding of special relativity concepts
  • Familiarity with geometric and arithmetic means
  • Knowledge of hyperbolic functions, specifically cosh
  • Basic algebraic manipulation skills in physics contexts
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  • Research the implications of the contraction factor in special relativity
  • Study the relationship between rapidity and Lorentz transformations
  • Explore the mathematical derivation of the relativistic factor ##\gamma##
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Students and professionals in physics, particularly those studying special relativity, as well as mathematicians interested in the application of means in physical contexts.

south
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Geometric and arithmetic means and contraction factor
Is it correct to state that the relativistic contraction factor is the ratio of the geometric mean to the arithmetic mean of the terms ##C+v## and ##C-v##?
 
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Why do you think so?
 
Ibix said:
Why do you think so?
I think the following:
Although mathematically it coincides, interpreting the contraction factor as the quotient of two means may not fit the physical nature of the phenomenon.
 
south said:
I think the following:
Although mathematically it coincides, interpreting the contraction factor as the quotient of two means may not fit the physical nature of the phenomenon.
There's nothing wrong with stating it. If you end up doing algebra in SR knowing identities for ##\gamma## is often helpful. I don't see that it adds any physical insight though. More useful to know that ##\gamma =\cosh\psi##, where ##\psi## is the rapidity.
 
Ibix said:
There's nothing wrong with stating it. If you end up doing algebra in SR knowing identities for ##\gamma## is often helpful. I don't see that it adds any physical insight though. More useful to know that ##\gamma =\cosh\psi##, where ##\psi## is the rapidity.
I don't find any correlation with the physical situation in that statement about the means. It seems like an empty mathematical game to me.
 
Yes. It might be a useful algebraic identity in some situation, but that's all.
 
Ok, agree. Thank you very much.
 

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