Text ( visual ) : unmediated Partial differential equations / [edited by D.C. Spencer]. -- Providence, R.I. : American Mathematical Society , 1973. -- vii, 505 p. ; 26 cm. -- (Proceedings of symposia in pure mathematics ; v. 23). -- "Proceedings of the Symposium in Pure Mathematics of the American Mathematical Society, held at the University of California, Berkeley, California, August 9-27, 1971."--T.p. verso ; Includes bibliographical references and indexes. -- ISBN 0821814230 ; (BA06756262) ; https://ci.nii.ac.jp/ncid/BA06756262 Author Heading(s): Symposium in Pure Mathematics ; Spencer, Donald Clayton ; American Mathematical Society. -- Classification(s): LCC : QA374 ; DC : 515/.353. -- Subject Heading(s): LCSH : Differential equations, Partial -- Congresses