The Classification of Quadrilaterals [Usiskin] - Printable Version +- MKLab (https://mklab.gr) +-- Forum: [INDEX] (https://mklab.gr/forumdisplay.php?fid=1) +--- Forum: MATHEMATICS (https://mklab.gr/forumdisplay.php?fid=3) +---- Forum: BOOKS (https://mklab.gr/forumdisplay.php?fid=6) +----- Forum: NEW PUBLICATIONS (https://mklab.gr/forumdisplay.php?fid=42) +------ Forum: FOREIGN (https://mklab.gr/forumdisplay.php?fid=91) +------- Forum: PURE AND APPLIED MATHS (https://mklab.gr/forumdisplay.php?fid=94) +------- Thread: The Classification of Quadrilaterals [Usiskin] (/showthread.php?tid=439)

The Classification of Quadrilaterals [Usiskin] - mklabgr - 06-16-2026 Summary The Classification of Quadrilaterals: A Study in Definition (a seminal mathematics education book by Zalman Usiskin and Jennifer Griffin) examines how seemingly standard geometry concepts lack universally agreed-upon definitions. It highlights two major approaches to classification: inclusive (nested) vs. exclusive (disjoint), and maps how differing interpretations alter logical hierarchies in geometry. BOOK PAGE