uf : coordinate in the forward iterative map. The dimension and sequence unit represented are indicated by sub and supra-indexes, ujf(i) MathType@MTEF@5@5@+=feaafiart1ev1aaatCvAUfKttLearuWrP9MDH5MBPbIqV92AaeXatLxBI9gBaebbnrfifHhDYfgasaacH8akY=wiFfYdH8Gipec8Eeeu0xXdbba9frFj0=OqFfea0dXdd9vqai=hGuQ8kuc9pgc9s8qqaq=dirpe0xb9q8qiLsFr0=vr0=vr0dc8meaabaqaciaacaGaaeqabaqabeGadaaakeaacqWG1bqDdaqhaaWcbaGaemOAaOgabaGaemOzayMaeiikaGIaemyAaKMaeiykaKcaaaaa@340B@ represents the position in the jth dimension of the iterative map for the ith unit of the sequence.