Bernard Bolzano Gesamtausgabe / Reihe II: Nachlaß. B. Wissenschaftliche Tagebücher. Band 12,1: Miscellanea Mathematica 21

In this diary, Bolzano does a detailed study of the concepts of multiplication, continuity, the curvature of space curves, the congruence of spatial figures and the solution to nth degree equations. Moreover there are a number of exercises for the determination and geometric representation of plane curves, exercises on the theory of probability and an essay on physics containing commentaries and critiques of the viable explanations for physical phenomena and suggestions for alternative explanations.