Jon, As far as "predicate" and "proposition" go, usage varies promiscuously. Some people use them to mean syntactic elements, in the S & I domains. Some people use them to mean objective elements, in the Object domain. In a sign relational setting we need to admit both types of elements and we need to be clear about their distinctive roles in the triadic sign relation at hand.
It can help to use a tactic that is common in computer science, simply tack the epithet "expression" or "name" on the end of the formal object name you have in mind in order to denote the associated semiotic entity, e.g., function / function expression, predicate / predicate expression, proposition / propositional expression, and so on. In many contexts one can then use the terms equivocally in the usual way, adding the epithet only when necessary to focus on the syntax. Regards, Jon On 2/10/2017 10:01 AM, Jon Alan Schmidt wrote:
John, List: JFS: For teaching Peirce's semiotic, I therefore recommend that those five words should be replaced with terms that CSP himself used: mark, token, type; icon, index, symbol; predicate, proposition, argument. I have no problem with mark/token/type, but "predicate" and "proposition" usually designate symbols. What would be some examples of a predicate that is an icon or an index, or a proposition that is an index? Demonstrative pronouns like "this" or "that" are usually classified as rhematic indexical legisigns, but it seems odd to call them "predicates" when their only function is to pick out subjects. Regards, Jon Alan Schmidt - Olathe, Kansas, USA Professional Engineer, Amateur Philosopher, Lutheran Layman www.LinkedIn.com/in/JonAlanSchmidt - twitter.com/JonAlanSchmidt
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