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For any real number , we have The equation is the power series definition of the exponential function, and the equation is known as Euler’s formula.

*Fermat’s lost proof.* I have a proof of this theorem, but
there is not enough space. ◻

Einstein’s journal paper (Einstein 1905) and Dirac’s book (Dirac 1981) are physics-related items.

*The Principles of Quantum Mechanics*. International Series of Monographs on Physics. Clarendon Press.

*Annalen Der Physik*322 (10): 891–921.