Czerwik, S. On sign-preserving solutions of a linear functional equation. (English) Zbl 0152.35203 Ann. Pol. Math. 20, 73-79 (1968). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Keywords:functional analysis PDFBibTeX XMLCite \textit{S. Czerwik}, Ann. Pol. Math. 20, 73--79 (1968; Zbl 0152.35203) Full Text: DOI