Corrigenda. The fourth line from below in the bibliography to the Russian original must be replaced by "lop., v. 12, 465 (1968). 8 Доклады Болгарской АН, т. 16, 465 (1963)."; the omitted reference in the bibliography to the English translation is "8. D. Skordev, Rekursiv vollst\"{a}ndige arithmetische Operationen, C. R. Acad. Bulgare Sci. 16 (1963), 465-467. MR 29 #4676."
Corrigenda (not concerning the online copy of the book). On p. xiii, line 18 from below, "three chapters" must be replaced by "three chapters and an appendix", and "appendices" must be replaced by "appendix" on the next line. On p. xiv, line 3 from above, "The work of" must be replaced by "The work on". On p. 4, line 9 from above, "P" must be replaced by "P*". On p. 84, line 16 from below, "Bekic" must be replaced by "Beki\'{c}". On p. 154, line 5 from below, "G '" must be replaced by "G '(". On p. 229, line 18 from above, the bar must be over "0" instead of being over "c". All occurrences of "vii" and "viii" on pp. 315-316 must be replaced by "xi" and "xii", respectively. The occurrences of "ix" on p. 315, line 14 from below, and p. 316, line 13 from below, must be replaced by "xii, xiii". All other occurrences of "ix" on pp. 315-316 must be replaced by "xii". On p. 315, line 11 from below, "103, 112" must be replaced by "8, 103, 112". A line with "L 119" on it must be inserted after line 6 from below on p. 319.
Corrigenda. On page 3, line 3 from above, "Sept. 17" must be replaced by "Sept. 11"; on line 17 from below of the same page, "series 21" must be replaced by "series [21]"; on page 5, line 31 from above, "1963" must be replaced by "1953".
Corrigendum (not concerning the online version of the paper). On p. 19, lines 3-4 from above, "a Section of Mathematical Logic" must be replaced by "a Section of Logic".
Corrigendum On p. 62, line 16 from above, "1948" must be replaced by "1958".