Otto Stolz

Otto Stolz (3 July 1842 – 23 November 1905)[1] was an Austrian mathematician noted for his work on mathematical analysis and infinitesimals.

Two years later he studied in Berlin under Karl Weierstrass, Ernst Kummer and Leopold Kronecker, and in 1871 heard lectures in Göttingen by Alfred Clebsch and Felix Klein (with whom he would later correspond), before returning to Innsbruck permanently as a professor of mathematics.

His work began with geometry (on which he wrote his thesis) but after the influence of Weierstrass it shifted to real analysis, and many small useful theorems are credited to him.

For example, he proved that a continuous function f on a closed interval [a, b] with midpoint convexity, i.e.,

His work, as well as that of Paul du Bois-Reymond, was sharply criticized by Georg Cantor as an "abomination".