10 2. PRELIMINARIE S O N CAPACITIE S We concentrate ou r effort s o n th e proo f o f Theore m 2.1 . Wh y Theore m 2. 2 i s simultaneously proved , an d wha t othe r capacitie s ca n be included i n the scheme, is discussed i n Sectio n 5.5 . Notice tha t som e particula r example s o f Theore m 2. 1 were considere d i n [18] , [36].
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