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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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4.3 ★★★★★
Based on 22 reviews
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Product Reviews
★★★★★ 5
Good buy
Love these. Easy clean up and use. As described
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 7, 2026
★★★★★ 4
Value, Durability, Everyday Use
What I liked:
- Price-to-value is the standout. These were significantly better priced than similar packs I’ve bought from local grocery stores and big discount retailers.
- For everyday, disposable use—think casseroles, baked pasta, brownies, roasted veggies—the lighter weight is perfectly fine.
- They stack neatly and are easy to store, which matters when you’re buying in bulk.
What I didn’t like:
- They’re a bit flimsier and not as thick as the store-brand pans I’ve used before. You can feel the difference when you handle them.
- For heavier dishes (large lasagnas, big roasts, or anything dense with sauces), a single pan can flex more than I’d like.
How I used them:
- Over the past couple of weeks, I’ve used these for baking brownies, roasting chicken thighs with vegetables, and prepping freezer meals. When I expected more weight or lots of liquid, I doubled up the pans, which solved the flex issue and kept everything stable.
- I also tested bending one to compare sturdiness. In the accompanying video, you’ll see me gently flexing the pan to show the “give.” In the photo, I placed this pan next to a thicker pan I bought at a regular store so you can see the difference in gauge.
My takeaway:
- If you need heavy-duty pans for very weighty dishes, these aren’t a perfect one-for-one replacement for thicker, premium options. However, for routine baking, storage, and serving—especially when you plan to toss the pan afterward—the cost savings make a lot of sense.
- Doubling them for heavier recipes is a simple workaround that maintains stability while still keeping the overall cost lower than buying thicker single-use pans.
Verdict:
- I’ll be purchasing these again for everyday use and bulk meal prep. The value is strong, and the performance is solid when you match the pan to the job or double up as needed.
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Reviewed in the United States on April 15, 2026
★★★★★ 5
Easy clean up
Sturdy. Various uses.
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Reviewed in the United States on March 7, 2026
★★★★★ 5
pans
good
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Reviewed in the United States on January 31, 2026
★★★★★ 2
Terrible!!
VERY lightweight and flimsy. I wouldn't trust these pans with anything! Oh... they might be okay for serving potato chips or popcorn.
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Reviewed in the United States on May 24, 2026
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