Gelfond–Schneider constant
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The Gelfond–Schneider constant is
which Aleksandr Gelfond proved to be a transcendental number using the Gelfond–Schneider theorem, answering one of the questions raised in Hilbert's seventh problem.
Its square root is
which can be used in a nonconstructive proof that an irrational number to the power of an irrational number can sometimes produce a rational number.