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|Icons||Berka I 29
Icon/Peirce: degenerate relation between sign and object: mere similarity.
Berka I 35f
Icon/logic/Peirce: Icons of logic: 1. Identity formula: x > y (implication) - second switch-over of antecedents (premises) - 3. transitivity of the copula (= modus barbara) -> copy of a final chain - ((s) icons/Peirce/(s): always have to do with representation and observability of similarity).
Icons/logic/Peirce: 4. Icon: negation: b should be so that we can write, b > x whatever x may be, then b is wrong ((s) EFQM) - ..if from the truth of x the falsity of y follows, then, also conversely, from the truth of y follows the falsity of x - 5. Icon: law of excluded third.
Icons/logic/Peirce: 9. Icon: every individual can be considered as a unit class - 10. Icon: complement - 11. Icon: Association - 12. Two distinct classes must differ in at least one element.
Ch. S. Peirce
Philosophical Writings 2011
K. Berka/L. Kreiser
Logik Texte Berlin 1983