| 5828 | Extension is the class of things, intension is the correct definition of the thing, and intension determines extension [Lewis,CI] |
| 4896 | The intension of an expression is a function from possible worlds to an appropriate extension [Perry] |
| 5826 | The intension of "lemon" is the conjunction of properties associated with it [Schwartz,SP] |
| 4063 | In intensional contexts, truth depends on how extensions are conceived. [Crane] |
| 10408 | Intensions are functions which map possible worlds to sets of things denoted by an expression [Swoyer] |