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Edsger W. Dijkstra

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A convincing demonstration of correctness being impossible as long as the mechanism is regarded as a black box, our only hope lies in not regarding the mechanism as a black box.
--
Dijkstra (1970) "Notes On Structured Programming, corollary at the end of section 3, On The Reliability of Mechanisms" (EWD249).

 
Edsger W. Dijkstra

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