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pxgsyx egi s fexegr gixi fvsgesyxD yvwi WP sxsi yp weriwesg yvsr egehiw yp gsixgi eee PHII ∆ r c n = c n − c n+r nd ∆c n = ∆ 1 c n . PHIH wthemtis ujet glssi(tion X RHeQHD RPeIHF uey words nd phrses X rigonometri seriesY uniform onvergeneY numer sequenesY est pproximtionF he pper is in (nl form nd no version of it will e pulished elsewhereF hysX IHFRHTRGWPEHEPQ QQW snstytut wtemtyzny exD PHIIdoi:10.4064/bc92-0-23 fatcat:l5nnzlau6vf7rpy55olo5ybley