display all the ideas for this combination of texts
4 ideas
13244 | Relevant necessity is always true for some situation (not all situations) [Beall/Restall] |
Full Idea: In relevant logic, the necessary truths are not those which are true in every situation; rather, they are those for which it is necessary that there is a situation making them true. | |
From: JC Beall / G Restall (Logical Pluralism [2006], 5.2) | |
A reaction: This seems to rest on the truthmaker view of such things, which I find quite attractive (despite Merricks's assault). Always ask what is making some truth necessary. This leads you to essences. |
8554 | Possible difference across worlds depends on difference across time in the actual world [Shoemaker] |
Full Idea: The ways in which a given thing can be different in different possible worlds depend on the ways in which such a thing can be different at different times in the actual world. | |
From: Sydney Shoemaker (Causality and Properties [1980], §05) | |
A reaction: Where change in a thing is possible across time in the actual world seems to require a combination of experiment and imagination. Unimaginability does not entail necessity, but it may be the best guide we have got. |
15764 | 'Conceivable' is either not-provably-false, or compatible with what we know? [Shoemaker] |
Full Idea: We could use 'conceivable' to say it is not provable that it is not the case, or we could use it to say that it is compatible with what we know. | |
From: Sydney Shoemaker (Causality and Properties [1980], §10) | |
A reaction: Rather significant, since the first one would seem to allow in a great deal that the second one would rule out. Any disproof of some natural possibility founders on the remark that 'you never know'. |
8562 | It is possible to conceive what is not possible [Shoemaker] |
Full Idea: It is possible to conceive what is not possible. | |
From: Sydney Shoemaker (Causality and Properties [1980], §10) | |
A reaction: The point here is that, while we cannot clearly conceive the impossible in a world like mathematics, we can conceive of impossible perceptions in the physical world, such as a bonfire burning under water. |