Jerry, List: I explained the quoted statement in the remainder of the same paragraph.
JAS: In logic, possibility and necessity are not *predicates *any more than existence/actuality. Instead, they are *modalities*, which is why axioms must be added to classical logic to incorporate them, one of which is called T--if a proposition is necessarily true, then it is actually true. In the Gamma part of Existential Graphs, anything within a solid cut within a broken cut is asserted to be *possibly *true, while anything within a broken cut within a solid cut is asserted to be *necessarily *true. However, when Peirce ultimately abandoned cuts altogether in favor of shading, he needed a new notation for such graphs--"I shall now have to add a *Delta *part in order to deal with modals" (R 500:3, 1911). Unfortunately, he never spelled out what he had in mind, but my newly published paper describes a plausible candidate ( https://doi.org/10.2979/csp.00026). Regards, Jon Alan Schmidt - Olathe, Kansas, USA Structural Engineer, Synechist Philosopher, Lutheran Christian www.LinkedIn.com/in/JonAlanSchmidt / twitter.com/JonAlanSchmidt On Sun, Oct 27, 2024 at 2:17 PM Jerry LR Chandler < [email protected]> wrote: > List, Jon: > > On Oct 26, 2024, at 7:17 PM, Jon Alan Schmidt <[email protected]> > wrote: > > In logic, possibility and necessity are not *predicates *any more than > existence/actuality. > > ??? > Why? > What forms of logic are you referring to? > Which grammar of which logic informs your assertion? > How is it plausible that this assertion is meaningful? > > [This statement directly contradicts chemical, biochemical and biological > equilibrium processes as was well described by A. N. Whitehead.] > > Cheers > Jerry >
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