Abstract
A paper on ordinal partitions by Erdős and Milner [7] has been formalised using the proof assistant Isabelle/HOL, augmented with a library for Zermelo–Fraenkel set theory. The work is part of a project on formalising the partition calculus. The chosen material is particularly appropriate in view of the substantial corrections [8] later published by its authors, illustrating the potential value of formal verification.
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