Appendix B: Mathematical formalities and style

p. 670, first full paragraph, fourth line, and second full paragraph, last line: ``Schwartz'' should be ``Schwarz.''
p. 668, first line of second paragraph, also first line of third paragraph: publication year of Lighthill book is 1958, not 1957.
p. 668, sixth-to-last line: ``Aczel'' should be ``Aczél'' (add accent).
p. 668, second-to-last line: ``Stieltjes'' should be spelled without an accent.