It only appears difficult to those who lack imagination.
I have read all this stuff up years ago. The Internet, that wondeful source of information, abounds with contributions from those far more erudite in the sciences than I.
Here is the start of one such contribution: This is not the website for developing this sort of discussion, so you must seek out the rest if you are interested.
The Priority Myth
Excerpts from Chapter One
"It is easily proven that Albert Einstein did not originate the special theory of relativity in its entirety, or even in its majority.1 The historic record is readily available. Ludwig Gustav Lange,2 Woldemar Voigt,3 George Francis FitzGerald,4 Joseph Larmor,5 Hendrik Antoon Lorentz,6 Jules Henri Poincaré,7 Paul Drude,8 Paul Langevin,9 and many others, slowly developed the theory, step by step, and based it on thousands of years of recorded thought and research.
Einstein may have made a few contributions to the theory, such as the relativistic equations for aberration and the Doppler-Fizeau Effect,10 though he may also have rendered an incorrect equation for the transverse mass of an electron, which, when corrected, becomes Lorentz' equation.11
Albert Einstein's first work on the theory of relativity did not appear until 1905. There is substantial evidence that Albert Einstein did not write this 1905 paper12 on the "principle of relativity" alone. His wife, Mileva Einstein-Marity, may have been co-author, or the sole author, of the work.13....................."
. . in 1927, H. Thirring wrote,
"H. Poincare had already completely solved the problem of time several years before the appearance of Einstein's first work (1905). . . ." 48
