Formalizing Dijkstra

We present a HOL formalization of the foundational parts of Dijkstra's classic monograph “A Discipline of Programming≓. While embedding programming language semantics in theorem provers is hardly new, this particular undertaking raises several interesting questions, and perhaps makes an interesting supplement to the monograph. Moreover, the failure of HOL's first order proof tactic to prove one ‘theorem’ indicates a technical error in the book.