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數學男孩圓周率之旅 (臺灣大學名譽教授 張鎮華): 3. 143. 1416 3. 1415926 201931. 4 108
作者: 張鎮華
圓是自然界與生活上常見的美妙形狀，它是神賜給人類的寶貴禮物，人自古以來就致力於瞭解其性質。要瞭解圓，就要瞭解圓周率，這個反應它的一個重要常數，小學時老師告訴我們圓周率是3.14，長大一點以後精確度提高到3.1416，到後來就用符號記為π。
整本書以數學男孩吉拉一生的經歷，串起古今圓周率計算的工作，並適度介紹與圓周率相關的數學。故事起自吉拉和女兒們討論圓周率，轉而回憶吉拉小時的求學經驗。
吉拉小學國語老師挑戰他們計算面積，接到初中學習幾何知識配合根號求值解決問題，輾轉到古代人對於圓周率的計算，集其大成者是南北朝數學家祖沖之，他求得的3.1415926是之後一千年內最精確的值。
吉拉四姊計算平方數的挑戰，及他高中時對於完全數的迷戀，指向數學上的計算很容易到達人力的極限。吉拉學習電腦的故事逐漸展現，數學知識加上電腦的威力，讓一些人力不能及的計算，完成到前所未有的境界。現代人對於圓周率的計算就是這個浪潮下的一個小浪花，其中2019年日籍女工程師岩尾算到小數點後31.4兆位數是一個旅程碑。
整本書以數學男孩吉拉一生的經歷，串起古今圓周率計算的工作，並適度介紹與圓周率相關的數學。故事起自吉拉和女兒們討論圓周率，轉而回憶吉拉小時的求學經驗。
吉拉小學國語老師挑戰他們計算面積，接到初中學習幾何知識配合根號求值解決問題，輾轉到古代人對於圓周率的計算，集其大成者是南北朝數學家祖沖之，他求得的3.1415926是之後一千年內最精確的值。
吉拉四姊計算平方數的挑戰，及他高中時對於完全數的迷戀，指向數學上的計算很容易到達人力的極限。吉拉學習電腦的故事逐漸展現，數學知識加上電腦的威力，讓一些人力不能及的計算，完成到前所未有的境界。現代人對於圓周率的計算就是這個浪潮下的一個小浪花，其中2019年日籍女工程師岩尾算到小數點後31.4兆位數是一個旅程碑。
作者
張鎮華
退休後現為臺灣大學名譽教授。年輕時取得美國康乃爾大學運籌學博士學位，回臺灣後先後在中央大學、交通大學、臺灣大學任教。一生致力於離算數學及組合最優化研究，特別是圖論及其演算法，發表過專業論文兩百多篇及專書三冊。曾參與108數學課程綱要研修，撰寫相關介紹文章數十篇。
張鎮華
退休後現為臺灣大學名譽教授。年輕時取得美國康乃爾大學運籌學博士學位，回臺灣後先後在中央大學、交通大學、臺灣大學任教。一生致力於離算數學及組合最優化研究，特別是圖論及其演算法，發表過專業論文兩百多篇及專書三冊。曾參與108數學課程綱要研修，撰寫相關介紹文章數十篇。
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Very good product and thanks for quality service.
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Arrived on time, good product and quality service. Thanks, and will buy again in the future.
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Reviewed in the United States on May 14, 2026
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Fast Delivery
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Fast delivery. Easy to install.
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Reviewed in the United States on April 12, 2026
★★★★★ 5
Our Standard Cartridges.
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These cartridges are the only ones that work for our Epson printer. in the past, I have tried 3rd party units with various degrees of success. Sometimes they will work and sometimes not. They are less expensive up front but, in the long run, I am going to stick with the genuine Epson product. They are the same price everywhere that I have shopped, so we purchase them from Amazon because of the free shipping. The Epson cartridges just work in our printer.
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Reviewed in the United States on January 4, 2026
★★★★★ 5
Bright, Dependable, and Jam-Free — Excellent Printer Paper!
Size: 1 Ream | 500 Sheets, Style: Letter (8.5x11)
The Amazon Basics Multipurpose Copy Printer Paper is a dependable and high-quality choice for all the daily printing needs, offering a bright white finish that makes text and images look sharp and professional. It feeds smoothly through the printer without any jams or misfeeds, which is essential for maintaining productivity throughout the day. The 20 lb weight feels sturdy and durable, making it perfect for everything from internal memos to important client documents. A great value-for-money purchase that provides consistent results every single time.
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Reviewed in the United States on May 23, 2026
★★★★★ 5
A Reliable Office Essential That Keeps Our Body Shop Running Smoothly
Size: 10 Reams | 5000 Sheets, Style: Letter (8.5x11)
In a busy auto body shop, we print a lot of paperwork every single day. Between repair estimates, insurance documents, invoices, work orders, and customer paperwork, having a dependable supply of printer paper is a necessity. Amazon Basics Multipurpose Copy Printer Paper has become one of those products that we always make sure to keep in stock.
The quality has been excellent for our everyday office needs. It feeds through our printers smoothly, produces clean, sharp documents, and we haven't experienced the jams or inconsistent performance that can sometimes come with lower-quality paper. Whether we're printing simple forms or detailed estimates, it gets the job done.
Another reason we continue to purchase it is the value. Running a business means paying attention to operating costs, and this paper offers a great balance between affordability and quality. We go through a large volume of paper, so being able to save money without sacrificing performance is a huge advantage.
I also appreciate the convenience of ordering it through Amazon. Instead of making extra trips to the office supply store, we can have it delivered directly to the shop and know that we'll always have enough on hand when we need it.
Overall, this has become our go-to copy paper for our business. It's dependable, high quality, and priced competitively. For any busy office, repair shop, or business that prints a large amount of paperwork, I think this is an excellent choice. We will definitely continue to purchase it and keep it stocked in our office.
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Reviewed in the United States on June 7, 2026