24 ideas
7786 | Propositional logic handles negation, disjunction, conjunction; predicate logic adds quantifiers, predicates, relations [Girle] |
7798 | There are three axiom schemas for propositional logic [Girle] |
7799 | Proposition logic has definitions for its three operators: or, and, and identical [Girle] |
7797 | Axiom systems of logic contain axioms, inference rules, and definitions of proof and theorems [Girle] |
7794 | There are seven modalities in S4, each with its negation [Girle] |
7793 | ◊p → □◊p is the hallmark of S5 [Girle] |
7795 | S5 has just six modalities, and all strings can be reduced to those [Girle] |
7787 | Possible worlds logics use true-in-a-world rather than true [Girle] |
7788 | Modal logic has four basic modal negation equivalences [Girle] |
7796 | Modal logics were studied in terms of axioms, but now possible worlds semantics is added [Girle] |
7789 | Necessary implication is called 'strict implication'; if successful, it is called 'entailment' [Girle] |
7790 | If an argument is invalid, a truth tree will indicate a counter-example [Girle] |
9295 | Not only substances have attributes; events, actions, states and qualities can have them [Teichmann] |
7800 | Analytic truths are divided into logically and conceptually necessary [Girle] |
7801 | Possibilities can be logical, theoretical, physical, economic or human [Girle] |
7792 | A world has 'access' to a world it generates, which is important in possible worlds semantics [Girle] |
19743 | A notebook counts as memory, if is available to consciousness and guides our actions [Clark/Chalmers] |
6176 | A mechanism can count as 'cognitive' whether it is in the brain or outside it [Clark/Chalmers, by Rowlands] |
19741 | If something in the world could equally have been a mental process, it is part of our cognition [Clark/Chalmers] |
19742 | Consciousness may not extend beyond the head, but cognition need not be conscious [Clark/Chalmers] |
19744 | If a person relies on their notes, those notes are parted of the extended system which is the person [Clark/Chalmers] |
9293 | Body-spirit interaction ought to result in losses and increases of energy in the material world [Teichmann] |
9294 | No individuating marks distinguish between Souls [Teichmann] |
9292 | The Soul has no particular capacity (in the way thinking belongs to the mind) [Teichmann] |