Galewski, MarekGalewska, ElżbietaSchmeidel, Ewa2016-02-022016-02-022014Electronic Journal of Differential Equations, Vol. 2014 (2014), No. 99, pp. 1-6.http://hdl.handle.net/11652/1035http://ejde.math.txstate.edu/We provide sufficient conditions for a mapping acting between two Banach spaces to be a diffeomorphism. Standart arguments allow us to obtain a local diffeomorphism. It is proved to be global using mountain pass geometry.enGlobal diffeomorphismlocal diffeomorphismmountain pass lemmaArtykuł