Mathematics數學
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Notes on ∏: why I multiply instead of add關於 ∏ 的筆記：我為何選擇相乘而非相加
The product operator, the summation sign, and a personal brand built on the difference.乘積符號、加總符號，以及一個建立在兩者差異上的個人品牌。
Horris Tse
Data Science · Confluence數據科學 · 匯流
Σ and ∏ are twins. One sums a series; the other multiplies it. On paper they differ by a single stroke. In practice they describe two entirely different ways of growing.
I named this place after the second one on purpose.
Σ 與 ∏ 是孿生兄弟。一個把級數相加，一個把它相乘。在紙上，它們只差一筆。在實踐中，它們描述的是兩種完全不同的成長方式。
我刻意以後者為這個地方命名。
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海納百川，自乘一派