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        "quote": "这一特定的围道给出的格林函数在 $\\tau < 0 ;$ 时为零；也就是说，对于 $x ^ { 4 } < x ^ { \\prime 4 }$ 为零。因此它被称为 <u class=\"concept-term\" data-concept-identity=\"urn:uuid:ff9f20ff-7034-4ebd-b37a-fa0a5de1c451\" data-concept-route=\"/concept-identities#concept-ff9f20ff-7034-4ebd-b37a-fa0a5de1c451\" id=\"first-86476f24d7196bf84708-zh\">出射波条件(outgoing wave condition)</u> 或 <u class=\"concept-term\" data-concept-identity=\"urn:uuid:fea39ea6-6745-42be-a5cf-5ad1ad507793\" data-concept-route=\"/concept-identities#concept-fea39ea6-6745-42be-a5cf-5ad1ad507793\" id=\"first-0c6a5a0c9b978798f3ad-zh\">推迟格林函数(retarded Green’s function)</u>，因为在 $( \\mathbf { X } ^ { \\prime } , \\ x ^ { \\prime 4 } )$ 才接通的源只影响较晚时刻的场点。如果当初选择围道位于极点上方，那么就会得到 <u class=\"concept-term\" data-concept-identity=\"urn:uuid:a0f33d5b-4bdb-46e8-ae40-393c840c6f62\" data-concept-route=\"/concept-identities#concept-a0f33d5b-4bdb-46e8-ae40-393c840c6f62\" id=\"first-27bc4e8abae23305209d-zh\">入射波条件(ingoing wave condition)</u> 或 <u class=\"concept-term\" data-concept-identity=\"urn:uuid:a7f6804f-360a-47ea-85b6-df05f924dc3c\" data-concept-route=\"/concept-identities#concept-a7f6804f-360a-47ea-85b6-df05f924dc3c\" id=\"first-9683ea08d13476321ae6-zh\">超前格林函数(advanced Green’s function)</u>。",
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