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] |
13931 | By using aporiai as his start, Aristotle can defer to the wise, as well as to the many [Haslanger] |
13925 | Ontology disputes rest on more basic explanation disputes [Haslanger] |
8249 | Class membership is not transitive, unlike being part of a part of the whole [Lesniewski, by George/Van Evra] |
13924 | The persistence of objects seems to be needed if the past is to explain the present [Haslanger] |
13930 | Persistence makes change and its products intelligible [Haslanger] |
13927 | We must explain change amongst 'momentary entities', or else the world is inexplicable [Haslanger] |
13928 | If the things which exist prior to now are totally distinct, they need not have existed [Haslanger] |
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] |
13929 | Natural explanations give the causal interconnections [Haslanger] |
13926 | Best explanations, especially natural ones, need grounding, notably by persistent objects [Haslanger] |