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QuoteRef: lehmF12_1988
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Reference
Lehman, F., "letter to the editor", Communications of the ACM, 31, 12, December 1988, pp. 1374-1375. Google
1374 ;;Quote: Peirce's system of existential graphs visually displayed an assertion and its logical structure
ThesaHelp: references i-l (342 items)
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Topic: history of mathematics (57 items)
Topic: sentences, propositions, and truth (23 items)
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Topic: flow diagrams and flow charts (21 items)