13 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] |
| 20660 | At one level maths and nature are very similar, suggesting some deeper origin [Wolfram] |
| 4304 | Descartes says there are two substance, Spinoza one, and Leibniz infinitely many [Cottingham] |
| 15377 | Definite descriptions pick out different objects in different possible worlds [Fitting] |
| 4303 | The notion of substance lies at the heart of rationalist metaphysics [Cottingham] |
| 4316 | Either all action is rational, or reason dominates, or reason is only concerned with means [Cottingham] |
| 4306 | For rationalists, it is necessary that effects be deducible from their causes [Cottingham] |
| 20659 | Space and its contents seem to be one stuff - so space is the only existing thing [Wolfram] |