**I** do not know if it is a coincidence or if publishers were competing for the same audience: after reviewing *The universe in zero word: The story of mathematics as told through equations*, in this post (and in CHANCE, to appear in 25(3)!), I noticed Ian Stewart’s *17 equations That Changed the World*, published in 2011, and I bought a copy to check the differences between both books.

**I** am quite glad I did so, as I tremendously enjoyed this book, both for its style and its contents, both entertaining and highly informative. This does not come as a big surprise, given Stewart’s earlier books and their record, however this new selection and discussion of equations is clearly superior to *The universe in zero word*! Maybe because it goes much further in its mathematical complexity, hence is more likely to appeal to the mathematically inclined (to borrow from my earlier review). For one thing, it does not shy away from inserting mathematical formulae and small proofs into the text, disregarding the risk of cutting many halves of the audience (I know, I know, high powers of (1/2)…!) For another, *17 equations That Changed the World* uses the equation under display to extend the presentation much much further than *The universe in zero word*. It is also much more partisan (in an overall good way) in its interpretations and reflections about the World.

** I**n opposition with *The universe in zero word*, formulas are well-presented, each character in the formula being explained in layman terms. (Once again, the printer could have used better fonts and the LaTeX word processor.) The (U.K. edition, see tomorrow!) cover is rather ugly, though, when compared with the beautiful cover of *The universe in zero word*. But this is a minor quibble! Overall, it makes for an enjoyable, serious and thought-provoking read that I once again undertook mostly in transports (planes and métros). Continue reading →

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