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數學好有事: 為什麼磁磚不做正5邊形、A系列影印紙長寬比要√2、向日葵和海螺有什麼共同祕密……全面影響人類生活的數學符號與定理, 以及背後的故事

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世上無巧合,數學可以完美且有效率地解釋一切。
讀懂箇中邏輯,就能理解另一種建構世界的方式。


陳宏賓(逢甲大學應用數學系助理教授╱UniMath主編)◎審訂

李國偉(中研院數學所兼任研究員)、李信昌(昌爸)(數學網站「昌爸工作坊」站長)、林福來(臺灣師範大學名譽教授、國際數學教育學心理學會會長、國際科學與數學教育研究期刊主編)、吳寬瀛(幾何造型藝術家)、洪萬生(臺灣師範大學數學系退休教授)、高涌泉(臺大物理系教授、國立臺灣大學科學教育發展中心主任)、游森棚(臺灣師範大學數學系教授)、賴以威(「數感實驗室」共同創辦人、臺灣師範大學電機系助理教授)◎專業推薦(按照姓氏筆畫序)

★兩位作者使用特殊數字為線索,串連起諸多領域的數學故事。不僅有核心理論的扼要描述,更能與最新的應用聯繫。作者寫作手法高明,穿梭轉折來去自如。譯筆生動流暢,更增添了閱讀的樂趣。──李國偉

★作者具備雄厚的數學素養,精心安排一趟24個數學景點的文化旅行,並且輕鬆自然的敘述關於景點的軼事、典故,讓旅人沉浸在一個接一個的故事中,理解數學知識的發展以及如何被廣泛應用在科學、技術和工程上。──李信昌(昌爸)

★我長期以幾何與數學當作創作題材,希望數學能更具體的呈現,而不只是符號或方程式。在創作的過程中了解了數學的美與實用性,數學絕不是只用來應付考試的工具。這本書讓數學更接近人群,生活處處有數學,值得推薦!──吳寬瀛

★本書兩位作者運用親切流暢的文筆、收放自如的進路,優遊於抽象與現實世界之間,向我們傳遞數學是有趣及有用的訊息。──洪萬生

★這本精彩的書以幾個特別的數字為種子,帶領讀者穿越時空,領略從文明初始一路到現代的數學發展。作者旁徵博引,收放自如,全書碰觸到數學的大部分領域,並旁及許多科學領域。譯筆通順流暢,沒有太多數學背景的讀者也可以享受。讀者從本書可以一窺整體的數學概貌,從中體會數學的無窮威力及無盡樂趣。──游森棚

 坐標系統是哲學家笛卡兒每天躺到日上三竿才發明的?
 0除以0的答案,竟然是個謎?
 A系列影印紙的長除以寬永遠是√2?
 Google在2004年首次公開募股,集資額是$2,718,281,828,原來另有玄機?
 若非質數,網路隱私很可能門戶洞開?
 在某個條件下,三角形的三個內角加起來不再是180度?
 幸運7其實不是真的幸運,而是機率?

數學背後所蘊藏的龐然秩序之美,自古以來,深深吸引了一群最熱愛規則、窮究邏輯,深信「萬物必有其理」的人。所謂的科學之路,其實是從人們所知的部分著手,再把做出的結果反覆驗算、證明,接著修正改進,或提出大膽新想法的一條漫長路途。在這條長路上,無數科學家前仆後繼,有些人努力的過程可歌可泣,有些人甚至為此斷送生命,還有些人則是誤打誤撞發現了足以改變世界的定理──但這些有趣的來龍去脈,卻鮮有人知。

事實上,如果你知道:

印度最偉大的數學家婆什迦羅為了安慰嫁不出去的女兒,用女兒的名字作為書名寫了一本數學書,正是這本書裡提到了重要的「0的運算」;

畢達哥拉斯學派在西元前五世紀的義大利簡直就是個幫派,而「世上只有有理數」便是幫規;

牛頓和萊布尼茲分別發明了微積分,此後為了誰先誰後而展開激烈爭論,一吵就是數十年;

還有更多更多在特殊數字背後的歷史軼事,數學就有了更多讓人進一步深入探索的好理由。也唯有在真正探索之後,你才可能想像,數學的邏輯多麼嚴密,竟能完美詮釋大自然和宇宙現象。

在本書裡,兩位熱愛數學的作者以淺白而幽默的筆法,從每個人最熟悉的0與1開始說起,揭開一個有血有肉、饒富趣味的數學世界──那些與生活最相關的數字,以及背後的故事與歷史,盡皆躍然紙上。無論是無理數發現者的最終下場、龐大的質數如何成為網路加密的關鍵、大自然不同物體上的螺旋形狀暗藏的數學規律、看不見的第四維如何影響了狹義相對論,還有許多懸而未解的世紀數學之謎,都如同一把鑰匙,打開了連接過去與未來的那道門,讓你見識到數學無遠弗屆的影響力。

◎為什麼一分是60秒?
60擁有12個因子,是100以下擁有最多因子的數字,六十進位制可以被較多數整除,基於此特性,60適用於計時。

◎A系列影印紙隱藏的祕密在於……√2。
我們使用的影印紙,如A5, A4, A3的長寬,長除以寬皆為√2。此比例有助於影印時將A4縮小為70%或71%左右到A5尺寸,A4放大140%或141%到A3尺寸,符合1/√2,也就是0.707106……

◎想在家裡鋪正五角形磁磚?抱歉,辦不到。
常見磁磚有方形,也有六角形、三角形,但卻沒有正五角形磁磚。原因很簡單,鋪滿地面的一圈為360度,五角形內角為108度,三塊磁磚只有324度,四塊為432度,加起來不是超過就是不足360度。事實上,確實有科學家為此絞盡腦汁,但最後宣告失敗。

伽利略曾說:「自然寫在宇宙這本大書上,而這本書是用數學語言寫成的。」本書收錄24篇關於數字的有趣來歷 + 古往今來眾多數學家絞盡腦汁尋找它們、來回辯證的經典史實,翻轉一般人對數學的枯燥印象,讓人看完直呼:「數學也太有事!」

304 pages, Paperback

First published January 1, 2014

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Rachel Thomas

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Displaying 1 - 9 of 9 reviews
30 reviews
January 1, 2024
If anyone wants a brief but throughly enjoyable tour through some of the most fascinating and beautiful parts of maths I would highly recommend numericon. From the origin of counting, to irrationality, fractals, and various other wonderful mathematical tidbits, numericon narrates and skims over the world of maths masterfully. Written for the layman, numericon explains everything it explores from the most basic principles. A wonderful book: 4.5 stars.
Profile Image for Myat Thura Aung.
85 reviews18 followers
July 1, 2019
Don't be fooled by the name. This book is not just about the numbers or number theory. It's, in fact, a short excursion for the general reader into different fields of mathematics. Despite its clumsy take on Godel's incompleteness theorems, it's overall a good read and can be quite witty and entertaining.
133 reviews2 followers
May 14, 2023
This nicely summarizes quite a lot of interesting mathematics in an engaging format--each chapter is ostensibly about a number. Some of these numbers (infinity, i, e, Graham's Number) do describe their chapters well, others are just nice starting points to delve into interesting math (3 and 4 go into dimensions; 6 into degrees of separation; 42 goes into simulations, via Douglas Adams; etc.). A very delightful book; I'm enjoying reading it with my 11-year-old. (Well, we didn't linger on the Riemann zeta function--one can skip to one's interests.)
Profile Image for Mike.
98 reviews5 followers
February 15, 2025
Got a bit complex to read at times. But the things I've learned and relearned ain't imaginary. Nicely written reminder of the power, elegance, and hidden gems in math, and how it runs the world in oh so many ways. Chapters numbers are brilliant!
Profile Image for Shira.
22 reviews2 followers
May 5, 2019
this is like the US weekly of math
Profile Image for Abdulrahman.
84 reviews
March 16, 2025
An amazing book..
Gives a pretty great overview of maths, with a few jokes and twists.

Has some history (including dead mathematicians)
Profile Image for Maurizio Codogno.
Author 75 books147 followers
September 22, 2020
Carino, ma mi pare manchi qualcosa

Le autrici di questo libro sono editor di Plus Magazine, e quindi sono abituate a divulgare matematica. I vari numeri (interi, irrazionali anche se al posto di π hanno preferito usare τ, e già che c'erano anche l'unità immaginaria, oltre che l'incognita x) sono pertanto trattati da un punto di vista puramente matematico, anche se con molti agganci con la vita reale. Chi è abituato a leggere divulgazione matematica probabilmente non troverà molte cose nuove; ho però apprezzato il modo in cui le autrici hanno assemblato il materiale per ottenere uniformità e scorrevolezza, cosa che non è usuale in testi che per la loro stessa natura nascono frammentati. Alla fine mi è però rimasta una sensazione strana, come se mancasse qualcosa. Può darsi che la colpa sia la descrizione della quarta di copertina, che paragonava il libro a Etimologycon: no, non è la stessa cosa. Ah: mi raccomando, leggete la sezione finale sulla "bibliografia ragionata", che non è un semplice elenco di libri.
Profile Image for Farida El azab.
90 reviews
March 1, 2022
I loved the book it was soo interesting and intriguing.but there was alot of things that weren’t accurate historically. The topics could have been covered better than that.
Displaying 1 - 9 of 9 reviews

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