Changes

== A proof ==

== A proof ==

Proofs of the formula [[E=mc²]] abound in the scientific literature, in print and on the internet, though many of them are more complicated than they need to be, because they are proving it in a more wide-ranging and less focused context.  A good example may be found on pages 121-138 of ''Spacetime Physics'' by Edwin Taylor and John Wheeler (W. H. Freeman, 1966, ISBN 0-7167-0336-X).  An exposition on the internet may be found at Wikiversity.<ref name="wvarticles">Five lectures at Wikiversity.  The 4th one derives the formula:

Proofs of the formula [[E=mc²]] abound in the scientific literature, in print and on the internet, though many of them are more complicated than they need to be, because they are proving it in a more wide-ranging and less focused context.  A good example may be found on pages 121-138 of ''Spacetime Physics'' by Edwin Taylor and John Wheeler (W. H. Freeman, 1966, ISBN 0-7167-0336-X).  An exposition on the internet may be found at Wikiversity.<ref name="wvarticles">Five lectures at Wikiversity.  The 4th one derives the formula:

*[http://en.wikiversity.org/wiki/Special_relativity/space,_time,_and_the_Lorentz_transform Lecture 1]

*[https://en.wikiversity.org/wiki/Special_relativity/space,_time,_and_the_Lorentz_transform Lecture 1]

*[http://en.wikiversity.org/wiki/Special_relativity/momentum Lecture 2]

*[https://en.wikiversity.org/wiki/Special_relativity/momentum Lecture 2]

*[http://en.wikiversity.org/wiki/Special_relativity/energy Lecture 3]

*[https://en.wikiversity.org/wiki/Special_relativity/energy Lecture 3]

*[http://en.wikiversity.org/wiki/Special_relativity/E_%3D_mc%C2%B2 Lecture 4]

*[https://en.wikiversity.org/wiki/Special_relativity/E_%3D_mc%C2%B2 Lecture 4]

*[http://en.wikiversity.org/wiki/Special_relativity/spacetime_diagrams_and_vectors Lecture 5]</ref>

*[https://en.wikiversity.org/wiki/Special_relativity/spacetime_diagrams_and_vectors Lecture 5]</ref>

== See also ==

== See also ==