We do not realize the immense flash of genius brought to humanity by Poincaré.
His transformations are as brilliant as they are magnificent. Lorentz
had searched for them for years, without ever succeeding.
But Poincaré was an immense mathematician, the greatest of his time.
Coupled with philosophical reflections and very advanced physical
knowledge.
It is very regrettable that out of hatred, out of self-loathing (the
French people are in the entire history of peoples the ones who are the
most self-loathing), we have come to adulate instead a 27-year-old
cretin copyist whose closest friends said that he was incapable of
dividing by 2.
It was his friend Grossmann who had to do his calculations.
But that's life.
We will return to the transformations given by Poincaré in June 1905
(copied in September 1905 by Einstein).
They are magnificent, and open to a lot of conclusions, such as, for
example, the elasticity of lengths
by change of reference frame. I wrote: elasticity, not contraction.
We have a bar of length l in R, what will be its length in R'?
What does Poincaré tell us?
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