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        "quote": "更一般地，可以把Euler–Lagrange方程的解空间作为相空间，从拉格朗日形式过渡到哈密顿形式。这称为“[<u class=\"concept-term\" data-concept-reference=\"concepts/mechanics/covariant-phase-space\" data-concept-identity=\"urn:uuid:d9610d6a-94c7-4d15-9ecf-b32655776b7a\" data-concept-route=\"/concept-identities#concept-d9610d6a-94c7-4d15-9ecf-b32655776b7a\" id=\"first-98755a4c1bd6f23001aa-zh\">协变相空间(covariant phase space)</u>](../../../../../concepts/mechanics/covariant-phase-space)”，通常可选定 $t=0$，以该时刻的初始条件参数化解。还可直接从作用量构造这个空间上的一种泊松括号，称为“[<u class=\"concept-term\" data-concept-reference=\"concepts/mechanics/peierls-bracket\" data-concept-identity=\"urn:uuid:91e3781b-f12b-42af-bf58-371780386623\" data-concept-route=\"/concept-identities#concept-91e3781b-f12b-42af-bf58-371780386623\" id=\"first-6c57bd3b8c40600387c5-zh\">Peierls括号(Peierls bracket)</u>](../../../../../concepts/mechanics/peierls-bracket)”。对一般拉格朗日量，可采用这一方法或带约束的哈密顿力学方法。但只有特殊的一类拉格朗日量，才会给出线性相空间上的非退化泊松括号，恢复标准哈密顿形式的通常性质。",
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