Who first derived the solution to the heat equation over the whole real line?

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Partial answers - like when the derivation first occurred or who the major mathematicians working in this field at the appropriate time were - are also useful.

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It appears to me that Fourier did it. However, it appears that Laplace contributed a critical integral along the way, which Fourier discusses. The original manuscript of Fourier did not reduce everything to the form shown below, but this was found in the published version of the manuscript. Fourier's original work was denied publication for several years because of the controversial work on trigonometric expansions of general functions of the time. enter image description here

The above is a snip from page 372 of the Google e-book scan that is in the public domain. Of course this is not Fourier's original manuscript, but this is a well-regarded translation of such.

The cover page is shown below: enter image description here