Linked from
The 17 pages that link to Entscheidungsproblem, each with the reason it gives.
David HilbertRelated: Hilbert and Wilhelm Ackermann formulated this decision problem in 1928.
Turing machineRelated: Turing used his machine analysis to show that no general solution exists.
Alan TuringRelated: Turing proved that no general procedure can solve this decision problem.
Alonzo ChurchRelated: Church proved that no general decision procedure exists for first-order logic.
Undecidable problemRelated: The negative solution established a prominent form of undecidability.
Formal scienceRelated: Its negative resolution exposed a boundary on mechanical proof checking.