Clapham, C. R. J. Finitely presented groups with word problems of arbitrary degrees of insolubility. (English) Zbl 0232.20063 Proc. Lond. Math. Soc., III. Ser. 14, 633-676 (1964). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 ReviewCited in 18 Documents MSC: 20F10 Word problems, other decision problems, connections with logic and automata (group-theoretic aspects) PDFBibTeX XMLCite \textit{C. R. J. Clapham}, Proc. Lond. Math. Soc. (3) 14, 633--676 (1964; Zbl 0232.20063) Full Text: DOI