## Opinion

### From the critics

### Community Activity

#### Quotes

Add a QuoteOMG!!! LOL!!! It turns out that if we calculate 1/n! for every number starting from 0, then add up all the terms, the answer is e.

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Euler’s identity is the “To be or not to be” of mathematics, the most famous line in the oeuvre and a piece of cultural heritage that resonates beyond its field: e^iπ + 1 = 0

...The equation is mind-blowing. It cleanly unites the five most important numbers in math: 1, the first counting number; 0, the abstraction of nothing; π, the ratio of a circle’s circumference to its diameter; e, the exponential constant; and i, the square root of minus one.

Jokes are stories with a setup and a punch line. You follow them carefully until the payoff, which makes you smile. A piece of math is also a story with a setup and a punch line. It’s a different type of story, of course, in which the protagonists are numbers, shapes, symbols and patterns. We’d usually call a mathematical story a “proof,” and the punch line a “theorem.”

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It is really rule of 69:

So, the number of compounding periods tit takes for a quantity to double is 69 divided by the percentage growth rate R. Because 72 is an easier number to divide than 69, the number most commonly used in the rule is 72, even though 69 would be more accurate.

## Comment

Add a CommentFun for anybody who plays mental games with numbers. The math is easy to follow, at least until you get to the very end of the book. Even there, the word descriptions are quite good.

Thanks to the library readers for discovering this book for me. It is a page turner, entertaining and informative ... only disappointed when it ended. However, its large collection of references are great reads on their own. Took quite a bit of notes and found more interesting math/human stories as "The Accidental Ecoterrorist" from LA Times Magazine:

http://www.lamag.com/longform/the-accidental-ecoterrorist/

This is an outstanding book, if you aren't math-conversant, you will learn a great deal; if you are math-conversant, the author will present information in a most brilliantly lucid fashion to the reader's delight! Clearly, this author has a very superior grasp of mathematics. Highly recommended.

As we all well know, we have a Love hate relationship with Math. We either love Math or Love to hate it. Well, here is a book that you will love regardless of which group you fall under!

I enjoyed every chapter and was just astounded by some of the things I read. More importantly, I found Alex Bellos explaining really tough concepts in a fashion that one could understand even with a very basic knowledge of Math. If you've always been somewhat scared of Math but wanted to learn more this book is the perfect answer; and if you're a Math lover/Geek you will love this book too.

Warning: the perfection of a circle can cause chills of excitement. Exponents have the power (pun intended) to blow your mind. Understanding calculus beats laughing at a great joke. Not convinced? Then ignore its groan-inducing title and pick up "The Grapes of Math," a fascinating, first-rate survey of the world of mathematics.

British mathematician and philosopher Alex Bellos argues not only that doing math results in aesthetic delight but also that math explains the workings of our entire world. He opens with chapters that explain our deep-seated feelings about numbers: why everyone chooses seven as a favourite, why one represents the masculine "yang" and two the feminine "yin." He then intriguingly discusses Benford's law: the abundance of numbers beginning with one or two and the paucity of higher initial digits in newspaper stories, populations, stock prices etc.

Moving on to geometry, algebra, calculus, the laws of logic and the nature of proofs, Bellos always shows how an esoteric discovery has practical applications. For example, the S segment of a curve, called the clothoid, serves as the transition path used by trains when moving from a straight to a circular path in order to avoid jolting passengers. Certainly, the mathematical principles can grow too complex for the non-expert; in these cases, Bellos advises skipping to the beginning of the next chapter, where he always starts with a clean slate and elementary concepts. In this way, the author guides readers through such marvels as pi and the exponential constant e, noting how often mathematicians deplored new concepts like imaginary numbers and infinity.

Aside from providing a great read for the intellectually curious, the book provides charming sketches of notables like the genius Leonhard Euler, the dysfunctional Bernoullis and the bitter rivals Leibniz and Newton who feuded over who invented calculus. Overall a fantastic book to stretch the brain and have fun doing so.