Keywords: 4Fold Root Figure 6n.gif en removed caption from File 4Fold Root Figure 6m gif in order to use it e g in §15 of The World as Will and Representation 1st book 1903 original publication date 2015-09-16 crop+upload date http //www archive org/details/onthefourfoldroo00schouoft Djvu file of Arthur Schopenhauer's essay On the Fourfold Root of the Principle of Sufficient Reason at archive org Arthur Schopenhauer other versions Custom license marker 2015 09 16 PD-old-100 Uploaded with UploadWizard On the Fourfold Root of the Principle of Sufficient Reason Geometry diagrams Pythagorean theorem Modifications by User Jochen Burghardt |