15 ideas
18889 | Ostensive definitions needn't involve pointing, but must refer to something specific [Salmon,N] |
14627 | S4, and therefore S5, are invalid for metaphysical modality [Salmon,N, by Williamson] |
15375 | If terms change their designations in different states, they are functions from states to objects [Fitting] |
15376 | Intensional logic adds a second type of quantification, over intensional objects, or individual concepts [Fitting] |
15378 | Awareness logic adds the restriction of an awareness function to epistemic logic [Fitting] |
15379 | Justication logics make explicit the reasons for mathematical truth in proofs [Fitting] |
11026 | Classical logic is deliberately extensional, in order to model mathematics [Fitting] |
10053 | Geometrical axioms imply the propositions, but the former may not be true [Russell] |
11028 | λ-abstraction disambiguates the scope of modal operators [Fitting] |
10052 | Geometry is united by the intuitive axioms of projective geometry [Russell, by Musgrave] |
18888 | Essentialism says some properties must be possessed, if a thing is to exist [Salmon,N] |
15377 | Definite descriptions pick out different objects in different possible worlds [Fitting] |
18886 | Frege's 'sense' solves four tricky puzzles [Salmon,N] |
18887 | The perfect case of direct reference is a variable which has been assigned a value [Salmon,N] |
18891 | Nothing in the direct theory of reference blocks anti-essentialism; water structure might have been different [Salmon,N] |