Fomenko, Tatiana N.2015-03-022015-03-022015-03-022014https://infoscience.epfl.ch/handle/20.500.14299/111799Some new results are presented concerning the search and approximation of solutions of equations in metric spaces using functionals strictly subordinated to a convergent series and functionals compatible with a convergent series. These classes of functionals were earlier introduced by the author.text::report