Questions tagged [necessity]

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Is existence itself necessary?

I define ‘existence’ here as the totality of being, and I take it as obvious that existence is actual. In this context, ‘necessary’ will be defined as ‘must exist because it cannot fail to exist’. The ...
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Metaphysical vs ontological necessity

There are many forms of consequence. It seems that there should be some method of distinguishing between them. Of primary concern to philosophers are two types of consequence: physical causality and ...
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Is steam necessarily ice?

This question arose from the discussion of my recent question, [When is the first appearance of Phosphorus after March 21, 2021?][1] One of the other arguments in Kripke's 'Naming and Necessity' is ...
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When is the first appearance of Phosphorus after March 21, 2021?

Saul Kripke's argument, in his seminal 'Naming and Necessity', that Hesperus (the Evening Star) is necessarily Phosphorus (the Morning Star), has become one of the canonical examples of a posteriori ...
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Does the existence of a thing necessarily imply its logical necessity?

In formal logic, does the existence of a thing necessarily imply its logical necessity, i.e., is it possible for something to exist without being logically necessary? Can a logically unnecessary thing ...
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Does modus tollens capture the essence of “necessary condition”?

Does modus tollens capture the essence of "necessary condition"? (1) P → Q, ¬Q, … so ¬P. (2) So Q is a necessary condition of P. Is (1) the inner structure of (2)? Are any of these true: The ...
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What is the distinction between A-intension and C-intension?

I'm having a really hard time understanding a concept discussed in “Qualia and Analytic Conditionals” by Braddon-Mitchell and "Why We Need A-Intensions" by Jackson. Here's my extraction of these ...
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108 views

How would Leibniz respond to this objection to his argument for God's existence?

Leibniz argues for the existence of a necessary being using the Principle of Sufficient Reason (PSR). Any contingent fact about the world must have an explanation. (Principle of sufficient reason) ...
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Why for Spinoza is the essence of the mind eternal?

Quoted in The Oxford Handbook of Spinoza, 302. I'm confused as to why, if we express the essence of the body under the aspect of eternity -- which for the purposes of the question I take to mean its ...
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Kant tells us that necessity is an indication of a priori concepts

It is easy enough to grasp that necessity does not inhere in nature but it is more difficult to explain. Is there a clearer explanation?
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Boethius, Logical Necessity, and Accidental Necessity: A Solution to Free Will and Foreknowledge?

In his classic book, the Consolation of Philosophy (Book V), Boethius attempts to make an argument that libertarian free will and [divine] foreknowledge are not incompatible. His argument goes ...
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Analyticity and a priority

(1) Every bachelor is unmarried. I know this is one of the most famous examples (intensionally) denoting analytic and a priori propositions. No problems yet. (2) Every apple is a fruit. This one ...
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Are there examples of necessity other than logical necessity?

G. E. M. Anscombe writes the following (page 80): ...[Wittgenstein's] view, expressed at 6.37, that 'there is only logical necessity', and at 5.525, that the possibility of a state of affairs is ...
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A deontic premise that leads to a necessity from a permission

I wanted to devise some rules for myself, then formulate those rules using formal symbolic logic, and one of the rules that I have set for myself is : "Do not say what is unnecessary", in other words :...
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134 views

Are phenomenological essences experiences that occur in every possible world?

Are phenomenological essences the case in every world? I believe they are a priori, but are they necessary and immutable? A stock example of an essence is the extension of white. We seem to ...
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499 views

Is anything not proven impossible therefore possible?

Is it a truism that, except for that which is proven impossible, everything is or must be considered possible? If so, why? It seems to me to be an argument from ignorance to say that just because we ...
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Would a first cause exist necessarily, so that absences are uncaused?

Would a first cause exist necessarily? So, let's suppose God is the first cause. Does that mean he necessarily exists? Does He then mean that his effects also exist, contingently or not, so that ...
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127 views

Is metaphysical necessity an unambiguous concept, and if so, how do we capture it?

In Nature of Necessity (1974), Plantinga writes: The distinction between necessary and contingent truth is as easy to recognize as it is difficult to explain to the sceptic's satisfaction. ...we ...
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Must an eternal object be uncaused?

Let's say that we grant that item "X" is eternal. By "eternal" we mean that it has always existed and that it always will exist. Because "X" is eternal, does it follow that it MUST be uncaused?
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What is the Lange's viewpoint on laws of nature?

I am just wondering what is the Lange's philosophical perspective on laws of nature and what line of thought he follows in the contemporary debate.