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    "en": "inverse mapping"
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        "quote": "\n> [!definition] 原像\n>\n> 对任意 $U\\subseteq Y$，定义\n>\n> $$\n> \\varphi^{-1}(U)=\\{x\\in X\\mid\\varphi(x)\\in U\\}.\n> $$\n>\n> 即使<u class=\"concept-term\" data-concept-identity=\"urn:uuid:47c1c428-f32a-4c45-8750-2dc68caad65e\" data-concept-route=\"/concept-identities#concept-47c1c428-f32a-4c45-8750-2dc68caad65e\" id=\"first-62330ca021eddcddfc36-zh\">逆映射(inverse mapping)</u>不存在，<u class=\"concept-term\" data-concept-identity=\"urn:uuid:9778c275-047c-4ba5-88d8-10a3f4eb2a5a\" data-concept-route=\"/concept-identities#concept-9778c275-047c-4ba5-88d8-10a3f4eb2a5a\" id=\"first-cca7ba4bbd70474a1b10-zh\">原像(preimage)</u>仍然有意义。此时 $\\varphi^{-1}(U)$ 是原像集合的完整记号。\n",
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