xsi1_eThe integral part of the real number x (also denoted by [x]).
a(b+)a(b)si2_eContour integrals; the path of integration starting at the point a extends to the point b (along a straight line unless there is an indication to the contrary), encircles the point b along a small circle in the positive (negative) direction, and returns to the point a, proceeding along the original path in the opposite direction.
Csi3_eLine integral along ...

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