Observed arrival · 2026-09-02
Astrolábio, a hands-on mathematics textbook
An interactive Portuguese Mathematics A textbook for 12th-year students, combining theory, manipulable labs, and step-by-step national-exam exercises.
Field notes
The book is divided into core chapters and optional topics, with earlier-year trigonometry and analytic geometry supplied as dedicated review sections. Its exercises are not limited to routine practice: the visible scope includes 1,536 national-exam problems, while the laboratories cover subjects such as the Mandelbrot set, graphical area and integration, geometric transformations, and approximate root-finding. The homepage also exposes Portuguese, English, and Spanish language controls.
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