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神奇流形在哪里
Fantastic Manifolds and Where to Find Them
math
geometry
\[ \gamma(t) := (e^{2\pi i t}, e^{2 \pi i \alpha t}) \]
is an
\(\mathbb R \to \mathbb T^2 \subset \mathbb C^2\)
immersion (Note that it’s injective!). The corresponding…
short
诱导表示乱炖
math
algebra
在日常生产生活中，我们经常需要将一个群表示从一个子群扩展到整个群．在所有可能的选择中，诱导表示是最自然的一种．
2025/06/07
zh
short
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