VIPER is the first commercially available microprocessor whose design is claimed to have been proven correct. The controversy provoked by the claim reveals fundamental disagreement about the meaning of 'proof'.
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MacKenzie, D. The fangs of the VIPER. Nature 352, 467–468 (1991). https://doi.org/10.1038/352467a0
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DOI: https://doi.org/10.1038/352467a0
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