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Wilhelm
• Member for 4 years, 6 months
• Last seen more than 3 years ago
• Germany

When you have to solve a problem later, in real life, you will also be allowed to use all available sources of information (even including internet and your coworkers). Therefore it is a good idea to ...

I use a beautiful little story narrated by Helmut Kracke in order to demonstrate the size of the largest three-digit-number 9^9^9. Wotan, the God of the Teutons, had a very precious ring called ...

The answer to the question depends on the definition of number. If we define that a number is the set of its common representations, then the number 2 is the set {2, II, two, deux, 4/2, 6/3, ...}. ...

For mathematical monologue, dialogue, discourse, in short for communication including proofs ("A proof is any completely convincing argument" [Errett Bishop: "Schizophrenia in contemporary ...

We are so careful because $dy/dx$ is the limit of a sequence of fractions. This limit is not "the final term" of the sequence and does not entail that all terms of the sequence exist. We should be ...

According to my experience concrete examples like the following are best suited to support the understanding. Starting from the axes $y = 0$ and $x = 0$ I have always shown the following, one after ...