Śliwa, Wiesław2011-03-242011-03-242001Bull. Belg. Math. Soc. 8 (2001), 109-118.http://hdl.handle.net/10593/939It is proved that an orthogonal basis in a non-archimedean metrizable locally convex space E (in particular, a Schauder basis in a non-archimedean Frechet space E) is stable if and only if there is a continuous norm on E. Many others results are also obtained.enOrthogonal sequencesNon-archimedean Frechet spacesArtykuł