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        "quote": "被称为流形 $M$ 的 <u class=\"concept-term\" data-concept-identity=\"urn:uuid:8edfdb84-325b-48e9-8526-006d8053914f\" data-concept-route=\"/concept-identities#concept-8edfdb84-325b-48e9-8526-006d8053914f\" id=\"first-2b00b5e9bcab738f196a-zh\">欧拉示性数(Euler characteristic)</u>。一个我们不会尝试证明的非平凡结果是，贝蒂数是拓扑不变量——两个拓扑同胚的流形具有相同的贝蒂数和欧拉示性数 [13]。",
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