Further comments, with reply, on 'Detection of faults in programmable logic arrays' by J.E. Smith

In recent correspondence, L. Ye-Wei and J. Wei (see ibid., vol.C-35, p.930-1 (1986)) have shown two counterexamples that contradict theorems four and five of a paper by J.E. Smith (see ibid., vol.C-28, p.845-53 (1979)). In his reply, Smith (see ibid., vol.C-35, p.931 (1986)) stated an additional condition under which the theorems hold good. The commenters provide a counterexample that contradicts Smith's modified theorem five. They provide another counterexample that contradicts theorem three of Smith's original paper. In his reply, Smith corrects an error in his treatment.<
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