A practical example of mathematics teaching using the Internet

This paper is about my experience of using my personal web page, www.fermatsi.org, as a teaching source in Secondary School education. On this web page, you can find the best mathematics resources, above all in English and Spanish, that educate in a simple and effective way. During the course of this lecture I will detail several examples on different subjects and for different levels, including geometry, probability, calculus, etc. that might guider users-teachers, students and even their parents-as to how they might discover and access resources for their own teaching. Besides, the paper studies the role of the society in this field and explains how students would develop these subjects in a participative way in a mathematics class. At the end of the paper, I detail different points of view and impressions concerning the advantages and disadvantages of using the Internet.