The present code snippet just does an especific task. This is, given an ordered sequence of natural numbers, starting at zero, generate all the different permutations there can be. When we talk about permutations, the order of the sequence does matter. So, the sequence 0, 1, 2 differs from 2, 0, 1. For example, think about a 4-7-2 lock combination sequence. Changing the sequence to 2-7-4 would not open the lock, of course. Properly speaking in mathematics, we are talking about permutations, because the order does matter. On the other hand, if the order did not matter, we would be …

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By means of Mates8, graph coding becomes a bit easier. The web page has four textboxes so the figure gets bounded to the left, right, top and bottom; and a draw button. Additionally, a panel control will contain the image generated by the code after the button is pressed.

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The days when the calculator had almost 3 thousand visits a day have gone. Since then, there have been several major versions and lots of minor versions. Somehow, I feel pleased in that the present core algorithm follows the rules of the first I read; of course, extending the simplicity of just adding or multiplying to other operations. After many unsuccessful efforts, version #8 has the ability to parse matrix expressions and, at the same time, derivatives or integration symbols. Mates8 -Spanish or Catalan equivalent to English 'math8'- perhaps isn't the quickest, nor by far the most complete math library …

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The End.