12 ideas
| 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] |
| 11028 | λ-abstraction disambiguates the scope of modal operators [Fitting] |
| 6408 | Russell needed three extra axioms to reduce maths to logic: infinity, choice and reducibility [Grayling] |
| 15377 | Definite descriptions pick out different objects in different possible worlds [Fitting] |
| 6414 | Two propositions might seem self-evident, but contradict one another [Grayling] |
| 13550 | To be always happy is to lack knowledge of one half of nature [Seneca] |
| 13549 | Nothing bad can happen to a good man [Seneca] |
| 13548 | The ocean changes in volume in proportion to the attraction of the moon [Seneca] |