ZH
Read original on Zhihu Hot ListChinese article / discussion ↗Zhihu Hot ListLast observed #29 · 730K heat
There is no bijection from R³ to R², so how can a two-dimensional foil be created?
View original Chinese title
并不存在 R³→R²的一一映射，那怎么制造二向箔？
The reader’s brief
A two-dimensional foil is a fictional weapon in Liu Cixin’s The Three-Body Problem that reduces three-dimensional space to two dimensions.
The story
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Original articles & discussion
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Saved for later: Daily reading record · 2026-10-21Monthly reading archive
Ranking history & source details
First recorded Oct 21, 2026, 1:10 AM CST · latest Oct 21, 2026, 1:10 AM CST. Ranks reflect attention on each platform.
| Day | Platform | Best rank | Last rank |
|---|---|---|---|
| 2026-10-21 | Zhihu Hot List | #29 | #29 |