Mathematical Essays and Recreations - Schubert, Hermann, 1848-1911; McCormack, Thomas J. (Thomas Joseph), 1865-1932 (Project Gutenberg, 2008)
Notion and definition of number -- Monism in arithmetic -- On the nature of mathematical knowledge -- The magic square -- The fourth dimension -- The squaring of the circle.
Electronic text
Keywords: Circle-squaring; Hyperspace; Magic squares; Mathematics -- Philosophy