Gelfond's Constant is Transcendental/Historical Note

Historical Note on Gelfond's Constant is Transcendental
The question of the transcendental nature of Gelfond's constant $e^\pi$ was raised in the context of the $7$th problem of the Hilbert $23$.

That Gelfond's Constant is Transcendental was initially established in $1929$ by.

It was since determined to be a special case of the Gelfond-Schneider Theorem, established.