2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/154847The explicit formula for mobiusien function of fibonacci cobweb poset P is given for the first time by the use of definition of P in plane grid coordinate system.6 pagesCombinatoricsDiscrete Mathematics11Bxx; 11B39A note on mobiusien function and mobiusien inversion formula of fibonacci cobweb posettext