Mathematikum
August’s site of the month: Mathematikum This is the website of the Mathematics Museum in Gießen — it includes models and activities of interest to people of all ages.
Images des Maths
July’s site of the month: Images des Maths This site is affiliated to the French National Center for Scientific Research. It contains reports about the latest events in mathematical research, and up-to-date articles that contain interesting discussions and applications of mathematics…
The Revenge of the Infinitesimals
Originating author is Michèle Artigue. Infinitesimals played an essential role in the emergence and development of differential and integral calculus. The evident productivity of this calculus did not prevent recurrent and fierce debates about the nature of these objects and…
Elementary Mathematics from an Advanced Standpoint
From now on we will feature a different book every month that is likely to be of interest to secondary teachers wanting to know more about mathematics. We have made the decision to use this feature to bring older books…
Classifying objects
Originating author is Christiane Rousseau. Mathematics offers tools for classifying objects. But is that of any practical use? More than we can imagine at first sight… It could allow us to conclude that a knot cannot be unknotted without cutting…
NRICH
Starting in January, we began a “Site of the Month” feature. February’s site of the month is dedicated to: NRICH. NRICH is a team of mathematics teachers, who aim to enrich the mathematical experience for all. They provide engaging activities…
The Hairy Ball Theorem
Originating author is João Pimentel Nunes The Hairy Ball Theorem is from topology, that part of mathematics that is concerned with the form of spaces. For the most part, this result came from work at the end of the 19th…
Mathematics of Planet Earth
Each month, we will feature a site that we feel is relevant to aims of the Klein Project. The first site of the month is dedicated to: Mathematics of Planet Earth (MPE). MPE is an initiative of mathematical science organizations…
Calculators, Power Series and Chebyshev Polynomials
Originating author is Graeme Cohen. Of all the familiar functions, such as trigonometric, exponential and logarithmic functions, surely the simplest to evaluate are polynomial functions. The purposes of this article are, first, to introduce the concept of a power series,…
Dimension
Von Christiane Rousseau Übersetzt aus dem Englischen von Eva Klein (Universität Würzburg) Wie misst man die Größe eines geometrischen Objekts? Für Teilmengen einer Ebene verwenden wir dazu oft Umfang, Länge, Flächeninhalt, Durchmesser, etc. Diese Maßbegriffe reichen jedoch nicht aus, um…