Friedrichs, K. O. The identity of weak and strong extensions of differential operators. (English) Zbl 0061.26201 Trans. Am. Math. Soc. 55, 132-151 (1944). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 ReviewCited in 132 Documents Keywords:functional analysis PDFBibTeX XMLCite \textit{K. O. Friedrichs}, Trans. Am. Math. Soc. 55, 132--151 (1944; Zbl 0061.26201) Full Text: DOI