Hörmander, Lars On the singularities of solutions of partial differential equations with constant coefficients. Proc. internat. Sympos. partial diff. Equ. Geometry normed lin. Spaces I. (English) Zbl 0246.35016 Isr. J. Math. 13, 82-105 (1972). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 Review MSC: 35E10 Convexity properties of solutions to PDEs with constant coefficients PDFBibTeX XML