According to C.S. Peirce, deductive reasoning is of a diagrammatic nature. But it’s not always perfectly clear what the nature of a diagram is in this context (which is both semiotic and psychological). I’ve just put together a mini-essay that aims to clarify this. Due to all the links and quotes within it, reformatting it as an email would be time-consuming, so I’ll just give this link to it:
Meaning and Modeling (TS ·9) (gnusystems.ca) <https://gnusystems.ca/TS/ldm.htm#skelgram> . This takes you to a section of the ‘reverse’ side of my online book Turning Signs. Gary f.
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