Review Quotes:
"It is composed of four chapters, preceded and followed, respectively, by an insightful Introduction (pp. xi-xviii) and a summary ... . By bringing together philosophical reflection, historical analysis, and logical inquiry, the book opens a new perspective on a fascinating issue situated at a crucial turning point in nineteenth-century geometry and linked to a millenary tradition of foundational studies. It certainly deserves to be read by anyone interested in the history, philosophy, or foundations of geometry." (Marco Panza, Historia Mathematica, Vol. 74, 2026)