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        "quote": "设 $\\alpha : M  N$ 为可微映射，其中 $m$ $\\dim$ $M \\leq n$ $\\dim$ $N$。若切映射 $\\alpha _ { * } : T _ { p } ( M ) \\to T _ { \\alpha ( p ) } ( N )$ 在每一点 $p \\in M ; \\mathrm { i . e . , } \\alpha _ { \\ast }$ 处均为单射，即处处为非退化线性映射，则称该映射为 <u id=\"concept-15-immersion\" class=\"concept-term\" data-concept-identity=\"urn:uuid:1f605ba7-d55c-4c45-aa84-5df7c7af88e2\" data-concept-route=\"/concept-identities#concept-1f605ba7-d55c-4c45-aa84-5df7c7af88e2\">浸入(immersion)</u>。由逆函数定理可直接证明，在任意点 $p$ 及其像 $\\alpha ( p )$ 处存在图卡，使得映射 $\\hat { \\alpha }$ 表示为",
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