Kurepa, Svetozar A weakly measurable selfadjoint cosine function. (English) Zbl 0262.47011 Glas. Mat., III. Ser. 8(28), 73-79 (1973). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 2 Documents MSC: 47A60 Functional calculus for linear operators 47D03 Groups and semigroups of linear operators 46H99 Topological algebras, normed rings and algebras, Banach algebras PDFBibTeX XMLCite \textit{S. Kurepa}, Glas. Mat., III. Ser. 8(28), 73--79 (1973; Zbl 0262.47011)