In Joel W. Robbin's "Mathematical logic, a first course" there are five exercises (11 to 15, pp 169 & 170) the solutions to which constitute a proof of the unsolvability of the Entscheidungsproblem. If anyone knows if the solutions are to be found anywhere I'll be pleased to be told where. No, it's not homework!
2026-04-01 04:05:24.1775016324
Seeking a proof of the unsolvability of the Entscheidungsproblem
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