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ÏÐ×ÓÒ ´½º½µ
ÏØØ×ÒØÓÒ׸ØÛÚÕÙØÓÒÓÑ× ´½º½µ
σ ± = τ ± σ .
∂ ± = 1 2 (∂ τ ± ∂ σ
´½º½µ
) .
ÒØÓÒ×ØÖÒØ×ÒÚÓÐÚÒØÒÖݹÑÓÑÒØÙÑØÒ×ÓÖÓÑ ´½º½µ
Ì×ÖØÎÖ×ÓÖÓÓÒ×ØÖÒØ׺ÌÓÒ×ÖÚØÓÒÓØÒÖݹÑÓÑÒØÙÑØÒ×ÓÖ¹ ´½º½µ
ÝÏÝÐÒÚÖÒ¸ØÒÖݹÑÓÑÒØÙÑÓÒ×ÖÚØÓÒÕÙØÓÒÖÙ×ØÓ ÓÑ×∂ − T ++ + ∂ + T −+
´½º½µ
= 0ÛØ×ÑÐÖÖÐØÓÒÓÖ−↔+ºÆÓÛ¸×ÒT 0º×f×ÖØÖÖݸ
)ØÓÚÕÙØÓÒ
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ÌÒÖÐ×ÓÐÙØÓÒÓØÛÚÕÙØÓÒ××
+
ÑÔÐ×ØØØÙÖÖÒØfT ++×ÓÒ×ÖÚ×ÛÐи×Ò∂ − (fT ++ ) =
´½º¾¼µ X µ (σ, τ) = X µ R (τ − σ) + Xµ L
(τ + σ)
∂ + ∂ − X µ = 0 ,
T ++ = ∂ + X µ ∂ + X µ = 0 ,
T −− = ∂ − X µ ∂ − X µ = 0 .
−+
∂ − T ++ = 0 .
= T +− = 0