P ( N ) = 1 n h    ∏ a ∈ A   N 1  ( a )  A 1  ( a )           ( 79 )   MathType@MTEF@5@5@+=feaafiart1ev1aaatCvAUfKttLearuWrP9MDH5MBPbIqV92AaeXatLxBI9gBamrtHrhAL1wy0L2yHvtyaeHbnfgDOvwBHrxAJfwnaebbnrfifHhDYfgasaacH8akY=wiFfYdH8Gipec8Eeeu0xXdbba9frFj0=OqFfea0dXdd9vqai=hGuQ8kuc9pgc9s8qqaq=dirpe0xb9q8qiLsFr0=vr0=vr0dc8meaabaqaciaacaGaaeqabaWaaeGaeaaakeaacqWGqbaucqGGOaakieqacqWFobGtcqGGPaqkcqGH9aqpdaWcaaqaaiabigdaXaqaaiabd6gaUnaaCaaaleqabaGaemiAaGgaaaaakmaarafabaGae8Nta40aaSbaaSqaaiabigdaXaqabaGccqGGOaakcqWGHbqycqGGPaqkdaahaaWcbeqaaiabdgeabnaaBaaameaacqaIXaqmaeqaaSGaeiikaGIaemyyaeMaeiykaKcaaaqaaiabdggaHjabgIGioJWaaiab+bq8bbqab0Gaey4dIunakiaaxMaacaWLjaGaeiikaGIaeG4naCJaeGyoaKJaeiykaKcaaa@5594@