: Ben-Ari covers the Five-Color and Six-Color theorems, as well as Ramsey Theory, which investigates how large a system must be to guarantee a certain level of order. Accessibility and Pedagogy (PDF) Mathematical Surprises - ResearchGate
: The book’s technical highlight is Carl Friedrich Gauss’s algebraic proof for constructing a regular 17-sided polygon using only a straightedge and compass—a feat that eluded mathematicians for two millennia. Modern Applications: Origami and Combinatorics
: Proves that a straightedge alone is sufficient for these constructions, provided a single circle is already present on the plane.
You can download the ebook for free as it is an open-access publication authored by Mordechai Ben-Ari. It is available through various repositories, including OAPEN Library , SpringerLink , and Google Play . Essay: The Intellectual Elegance of Mathematical Surprises
A central pillar of the book is the exploration of geometric constructions. Ben-Ari highlights theorems that challenge our traditional reliance on specific tools:
: Demonstrates that every construction possible with a straightedge and compass can be achieved using only a compass.