Did Turing prove the undecidability of the halting problem?

Abstract

We discuss the accuracy of the attribution commonly given to Turing's 1936 paper "On computable numbers..." for the computable undecidability of the halting problem, coming eventually to a nuanced conclusion.

19 pages. Commentary may be made on the first author's blog at https://jdh.hamkins.org/turing-halting-problem. Minor revisions in v2 and v3