Elementare Arithmetik und Algebra

A List of Factorial Math Constants

The Second Story of Meno A Continuation of Socrates' Dialogue with Meno in Which the Boy Proves Root 2 is Irrational

The Fibonacci Number Series

The First 1000 Euler Numbers

Philosophy and Fun of Algebra

Sechs Vorträge über ausgewählte Gegenstände aus der reinen Mathematik und mathematischen Physik

The number-system of algebra treated theoretically and historically (2nd edition)

Mysticism and Logic and Other Essays

The Evanston Colloquium: Lectures on Mathematics Delivered From Aug. 28 to Sept. 9, 1893 Before Members of the Congress of Mathematics Held in Connection with the World's Fair in Chicago

Lectures on Elementary Mathematics

On the study and difficulties of mathematics