Mathematical Inequalities & Applications · Volume 24, Issue 1 Trigonometric approximation of functions in seminormed spaces 24-07 Pages 89-101 DOI 10.7153/mia-2021-24-07 Downloads Short PDF Full PDF PNG Authors Włodzimierz Łenski Uaday Singh Bogdan Szal Keywords seminorm rate of approximation the Jensen inequality Fourier series matrix means Subject classes 41A25 46E30 42A24 42A10 40C05