Śliwa, Wiesław2011-02-282011-02-282000-09Indag. Mathem., N.S., 11(3), 463-466.http://hdl.handle.net/10593/914It is proved that any infinite-dimensional non-archimedean metrizable locally convex space has an orthogonal basic sequence.enSchauder basic sequenceOrthogonal basic sequence