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Leonhard Euler . Leonhard Euler LeonhardEuler upload LeonhardEuler Creator Jakob Emanuel Handmann derivative work Bff Leonhard Euler Cropped Bff LeonhardEuler PDold original upload log This image is derivative work of the following images File LeonhardEuler with PDArt PDold Haham hanuka Bytes no English Leonhard Euler Source