By John Allen Paulos

ISBN-10: 0465050670

ISBN-13: 9780465050673

During this full of life quantity, mathematician John Allen Paulos employs his singular wit to lead us via an not likely mathematical jungle—the pages of the day-by-day newspaper. From the Senate and intercourse to celebrities and cults, Paulos takes tales that won't appear to contain math in any respect and demonstrates how mathematical naïveté can placed readers at a special drawback. even if he’s utilizing chaos idea to puncture financial and environmental predictions, utilising good judgment to elucidate the risks of spin doctoring and information compression, or utilising mathematics and customary feel to offer us a unique point of view on greed and relationships, Paulos by no means fails to entertain and enlighten.

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**Extra info for A Mathematician Reads the Newspaper**

**Example text**

N, as Lagrange multipliers. Notice that hi = n hi (s, t1 , . . , tn ) ((s, t1 , . .

Ii) Let x, yH ∈ H ∩ Ω or y, xH ∈ H ∩ Ω. Then |x − y| = |xH − yH | |xH − y|. 49). Since ε was arbitrary, the assertion follows. The following lemma shows that the two-point rearrangement depends continuously on its defining halfspace, see [37]. 5. Let u ∈ Lp (RN ) for some p ∈ [1, +∞), and let {Hn } be a sequence of halfspaces. 50) n→∞ then in Lp RN . 51) 0, and if BRn ⊂ Hn , n = 1, 2, . . , for some sequence Rn uHn −→ u +∞, then in Lp RN . 52) P ROOF. (1) Let H, Hn , n = 1, 2, . . 50). Then lim σHn x = σH x, n→∞ uniformly in compact subsets of RN .

Let u, v ∈ L2 (RN ), and let T be a rearrangement. 6). Then RN uv dx RN T uT v dx. 39) 14 F. Brock Rearrangements are nonexpansive in L∞ (RN ), too. 3. Let u, v ∈ L∞ (RN ), and let T be a rearrangement. 6). 40) ∞. P ROOF. Let C := u − v ∞ . e. on RN . e. 40). 4. For applications it is useful to define rearrangements of functions which are merely defined on a set M ∈ M. This can be done as follows: Let T a rearrangement, and let u : M → R measurable. 14). (Notice that in fact T u does not depend on the particular choice of c.

### A Mathematician Reads the Newspaper by John Allen Paulos

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