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On the Confinement Index


It is known that Wilson and 't Hooft loops are a  powerful tool for  probing confinement.
After a brief review of electric and magnetic screenings, I will talk  about the behavior of the
Wilson and 't Hooft loops and compute the confinement index in a wide  class of N=1
supersymmetric gauge theories.  Also I will show that such behaviors  are consistent
with the theta-angle periodicity and with the factorization property
of Seiberg-Witten curves.