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        "quote": "容易验证 $P_{\\mathbf{x}}^2=P_{\\mathbf{x}}$，因此 $P_{\\mathbf{x}}$ 是一个[<u class=\"concept-term\" data-concept-reference=\"concepts/linear-algebra/projection-operator\" data-concept-identity=\"urn:uuid:424805ab-e734-4973-9608-07892429420f\" data-concept-route=\"/concept-identities#concept-424805ab-e734-4973-9608-07892429420f\">投影算符(projection operator)</u>](../../../../../concepts/linear-algebra/projection-operator.md)。",
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