Riemann was the first to show the right way for research on the foundations of geometry by starting from the idea that space is a Zahlenmannigfaltigkeit, thus a system built... by ourselves.

— L. E. J. Brouwer On the Foundations of Mathematics (1907)

More quotes by L. E. J. Brouwer

On the Foundations of Mathematics (1907)

Quote text and notes from Wikiquote: L. E. J. Brouwer (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.