By G.M. Kelly

ISBN-10: 3540069666

ISBN-13: 9783540069669

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**Additional resources for Category Seminar**

**Example text**

Both? 51: Theorem: If A, B, and C are sets, then An (B U C) = (A n B) u (A n C). 36, but you should be able to produce some more examples now. For example, can you produce an example in which both sides are the empty set? One in which one term is the empty set? 52: Definition: A real-valued function f is convex on [a, b] if for every t, 0 ::; t ::; 1 and every Xl and X2 in [a, b] one has f(tXI + (1 - t)X2) ::; tf(Xl) + (1- t)f(X2). Explore this definition with some examples. Warning: this one is fairly hard.

That seems simple enough, but the shark 15 is also a non-example, and it is worth seeing why either alone is less useful than the pair. The definition of mammal has a number of conditions to be met, and a lizard is a simple non-example because it fails just about everyone of them. The shark is an extreme non-example because it fulfills many of the conditions (but not all of them). It shows why the definition has to include so many conditions: if the definition were to include only some conditions, the shark would not be excluded.

2 Real-Life Proofs vs. Rules of Thumb 45 by Murcheson's Law of Propinquity, you might well feel daunted. (You should. I just made up both Murcheson and the Law. 5 Exercises Insert in the following proofs the missing cues to what is going on. A good way to check what you've done is to exchange copies with a classmate. Remember that the goal is not simply to cue some proof, but to form and cue a good one that is easy to read. 12: The diagonals of a rhombus are perpendicular. Proof. AB ~ CD. LCAB ~ LACD using alternate interior angles.

### Category Seminar by G.M. Kelly

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