What is this used for?..i don,t see any utility on using it.. for Commuting and Anti-commuting operators we would have:(adsbygoogle = window.adsbygoogle || []).push({});

[tex] \delta{<A|B>}=i<A|\delta{S_{AB}}|B> [/tex]

but i don,t see that it provides a way to obtain Schroedinguer equation or the propagator for the theorie....what is SVP used for?..thanks.

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# Schwinger variational principle

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