On the usefulness of teaching calculus (especially in Zürich)

Richard Dedekind, 1858:

Die Betrachtungen, welche den Gegenstand dieser kleinen Schrift bilden, stammen aus dem Herbst des Jahres 1858. Ich befand mich damals als Professor am eidgenössischen Polytechnicum zu Zürich zum ersten Male in der Lage, die Elemente der Differentialrechnung vortragen zu müssen, und fühlte dabei empfindlicher als jemals frührer den Mangel einer wirklich wissenschaftlichen Begründung der Arithmetik

(in Stetigkeit und irrationale Zahlen, where Dedekind cuts are introduced); translation by W.W. Beman:

My attention was first directed toward the considerations which form the subject of this pamphlet in the autumn of 1858. As professor in the Polytechnic School in Zürich I found myself for the first time obliged to lecture upon the elements of the differential calculus and felt more keenly than ever before the lack of a really scientific foundation for arithmetic.

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Kowalski

I am a professor of mathematics at ETH Zürich since 2008.

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