Talk:Schwinger's variational principle

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[edit] I don't understand

From looking at good books (like Joachain, 1975) on scattering theory on Schwinger variatonal principle, I really don't understand what is the relation of this article with what is known in the literature under this name. Is the Schwinger variational principles really so simple? Since I don't know what is S_AB, I cannot judge. But as far as I know I am thinking at a crackpot!

• I agree with the user above, the value of S_AB should be indicated although if its an action perhaps is of the form:

where X is the position operator and V is the potential..