Combinatorial Identities by John Riordan

By John Riordan

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Wait, in order to continue, we need a second piece of notation! Ordered ntuples (a, b, . . , n) are members of the set denoted A × B × · · · × N, called the Cartesian product of the sets A, B, . . , N. The product principle. The number of elements in the Cartesian product of a finite number of finite sets A × B × · · ·× N is the product of their sizes |A| · |B| · · · · · |N|. 2, where we might consider |A| = 6 and |B| = 3. The same Cartesian product can be grouped as |B| copies of A, or as |A| copies of B.

In that case, mark it as something you need to go back to, and proceed in the hopes that life will improve. Be active, not passive, while reading. That means that you should try to answer any questions raised in the text and try to solve any problems posed, and definitely don’t trust the author’s claims. Yes, that last repeats a point made in the previous bullet point. That’s because it’s super-important. Ask yourself questions. (Do you sense a theme? ) For example, what are the main points of the section/chapter you just read?

5 Tips for Writing Mathematics So. About writing things up. There is not a single correct way to write, and as you write mathematics you will develop a mathematical writing voice of your own. Your first goal is always to communicate mathematics to a reader. Presumably that reader does not have identical comprehension of the particular mathematics to yours, or s/he wouldn’t need to read your write-up! This is particularly true with peers who are stuck on problems and seek your help. But you probably often have a second goal, namely, to communicate your understanding of mathematics.

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