Certain Simple, Unsolvable Problems of Group Theory. I1)1)Unless otherwise indicated, the results and proofs of this and subsequent related papers are as given (in somewhat more detail) in Several simple unsolvable problems of group theory related to the word problem, a doctoral dissertation accepted by Princeton University in April, 1952. The proof of the unsolvability of the quasi-MAGNUS problem was presented to a meeting of The Association for Symbolic Logic, April 28, 1951. (Abstract, Journal of Symbolic Logic, 16, 237.)Our thanks are due to Professors Alonzo Church and Roger Lyndon for their constructive suggestions regarding this dissertation; to Professor Wilhelm Magnus, for stimulating discussions regarding possible extensions.

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