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| '''Bondi ''k''-calculus''' is a method of teaching [[special relativity]] originated by Professor Sir [[Hermann Bondi]], and now common in university and college level physics classes.
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| The usefulness of the ''k''-calculus is its simplicity. It has been successfully used to teach special relativity to young children and also in relativity textbooks.
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| Many introductions to relativity begin with the concept of velocity and a derivation of the [[Lorentz transformation]]. Other concepts such as [[time dilation]], [[length contraction]], the [[relativity of simultaneity]], the resolution of the [[twin paradox|twins "paradox"]] and the [[relativistic Doppler effect]] are then derived from the Lorentz transformation, all as functions of velocity.
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| Bondi, in his book ''Relativity and Common Sense'', first published in 1962, reverses the order of presentation. He begins with the Doppler factor, denoted by the letter <math>k</math>. From this he explains the twins paradox, and the relativity of simultaneity, time dilation, and length contraction, all in terms of <math>k</math>. It is not until later in the exposition that he provides a link between velocity and the Doppler factor <math>k</math>. The Lorentz transformation appears towards the end of the book.
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| == References ==
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| *{{Cite book|last=Bondi|first=Hermann|author-link=Hermann Bondi|year=1980|title = Relativity and Common Sense|place=New York|publisher=Dover Publications|edition=Dover|isbn=0-486-24021-5|postscript=<!-- Bot inserted parameter. Either remove it; or change its value to "." for the cite to end in a ".", as necessary. -->{{inconsistent citations}}}}
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| *{{Cite book | author=Ray d'Inverno | year=1992 |title = Introducing Einstein's Relativity |publisher= Clarendon Press | isbn =0-19-859686-3}}
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| == External links ==
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| *[http://autotheist.synthasite.com/bondi1.php Review of Bondi k-Calculus]
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| [[Category:Special relativity]]
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| {{relativity-stub}}
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Revision as of 21:47, 1 March 2014
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