Originating authors are David Mumford and Christiane Rousseau. Foreword: This vignette is more difficult than others. However, in a few pages, it tells you how to explain in simple terms one of the most difficult open problems at the beginning…
Originating authors are Graeme L. Cohen (University of Technology, Sydney), Steven Galbraith (University of Auckland) and Edoardo Persichetti (University of Auckland). How can we safely send our credit card details over the internet, or using a mobile phone, when others…
Originating author is William Mc Callum. If two triangles have the same area and the same perimeter, are they necessarily congruent? It turns out that the answer is no. For example, the triangle with sides and has the same area…
（王婷 译 李建华 校 北京师范大学数学科学学院）
The need to create secure codes is said to go back to Julius Caesar, who moved letters in his messages up by three through the alphabet. That is encoding. How would you decode such a message? Modern day cryptography, which…
Englisch, Französisch, …