This is a charming mini dictionary of mathematical ideas and concepts. Presenting its content in short sections, grouped in a broadly historical format, the book works its way through number theory, geometry, trigonometry, algebra…, and so very much more.
Whether it be ‘perfect numbers,’ ‘irrational numbers,’ ‘square numbers’ (etc) the book provides a short summary of each concept, linked to where it occurs in the historical timeline.
The book even tries to cover a range of different cultures and milieus. A quote from (African) St Augustine illustrates the idea of perfect numbers. Ancient Greek (Delian) altars illustrate problems in the concept of doubling. The Arabic book of Shifting and Balancing explains where the word ‘algebra’ came from. And the issues and characters mentioned run right into the modern era.
While the fact that it only takes about 5 minutes to read each (short) chapter is a positive feature of the book, it is also occasionally a bit frustrating. For example, the chapters on ‘zero’ and on ‘negative numbers’ provided useful quick introductions to the concepts. But, historically, both ideas were highly controversial for a range of religious, cultural and pragmatic reasons. Unsurprisingly Greek philosophers who struggled with the ideas of ‘vacuums’ and of ‘creation out of nothing,’ really struggled with the idea of the nothingness of zero. It would have been good to hear a little more about how cultural issues like that impacted upon the reception of mathematical ideas.
One minor disappointment with the book was that the kindle edition which I read had no chapter numbers. It was all very well having a (long) list of very short chapters, but it is actually quite useful at times, being able to refer to a specific numbered chapter, especially when trying to find something.
Overall, this is an enjoyable read which is accessible to readers from any background, regardless of prior mathematical skills or abilities. Its brevity means that the book is unlikely to be particularly informative to students of mathematics, but more general readers who have perhaps not pursued mathematics at higher levels, will undoubtedly find nuggets of math-lore that they may not have encountered previously.