12611 | Necessity makes alternatives impossible [Aristotle] |
12381 | What is necessary cannot be otherwise [Aristotle] |
12734 | Every necessary proposition is demonstrable to someone who understands [Leibniz] |
13828 | Necessary truths are those provable from identities by pure logic in finite steps [Leibniz, by Hacking] |
12190 | Necessity is what will be, despite any alternative suppositions whatever [Mill] |
22623 | Necessity can only mean what must be, without conditions of any kind [Mill] |
16013 | Nothing necessary can come into existence, since it already 'is' [Kierkegaard] |
7134 | Something can be irrefutable; that doesn't make it true [Nietzsche] |
8375 | 'Necessary' is a predicate of a propositional function, saying it is true for all values of its argument [Russell] |
6099 | Modal terms are properties of propositional functions, not of propositions [Russell] |
11002 | Equating necessity with informal provability is the S4 conception of necessity [Lewis,CI, by Read] |
10921 | Necessity can attach to statement-names, to statements, and to open sentences [Quine] |
11880 | Kripke says his necessary a posteriori examples are known a priori to be necessary [Kripke, by Mackie,P] |
15290 | What reduces the field of the possible is a step towards necessity [Harré/Madden] |
8822 | Statements about necessities need not be necessarily true [Pollock] |
15086 | Absolute necessity might be achievable either logically or metaphysically [Hale] |
11001 | Equating necessity with truth in every possible world is the S5 conception of necessity [Read] |
5738 | We may be sure that P is necessary, but is it necessarily necessary? [Melia] |
11083 | A sentence is necessary if it is true in a set of worlds, and nonfalse in the other worlds [Hanna] |
16346 | Maybe necessity is a predicate, not the usual operator, to make it more like truth [Halbach] |
17742 | Scotus based modality on semantic consistency, instead of on what the future could allow [Walicki] |
19008 | The modern revival of necessity and possibility treated them as special cases of quantification [Vetter] |
19029 | It is necessary that p means that nothing has the potentiality for not-p [Vetter] |