Challenges to the principle of deductive closure?

Why does Nozick deny closure?

On the other hand, some epistemologists, including Robert Nozick, have denied closure principles on the basis of reliabilist accounts of knowledge. Nozick, in Philosophical Explanations, advocated that, when considering the Gettier problem, the least counter-intuitive assumption we give up should be epistemic closure.

What is the principle of deductive closure?

The deductive closure principle is based on the thought that one straightforward way to extend one’s knowledge is to competently deduce some proposition from one or more propositions that one already knows. G.E. Moore (1939) appears to presume this in his proof of an external world.

Which theory of knowledge denies closure?

Rejecting knowledge closure is therefore the key to resolving skepticism. Given the importance of insight into the problem of skepticism, they would seem to have a good case for denying closure. Let us consider the story they present, and some worries about its acceptability.

What is the principle of epistemic closure?


Epistemic closure principles state that members of an epistemic set (such as my justified beliefs) are closed under a given relation (which may be a non-epistemic relation, like entailment, or an epistemic one, such as known entailment).

What is the purpose of the closure principle?

Definition: The principle of closure states that people will fill in blanks to perceive a complete object whenever an external stimulus partially matches that object. Even when we’re missing information, we tend to make sense of our environment by filling in the gaps to see a complete object.

What is the no false lemmas condition?

Under No False Lemmas, knowledge is restricted to justified true beliefs that are based upon other truths, or facts of the matter – one cannot just so happen to know something in the way that the JTB definition of knowledge allows.

What is skeptical doubt?

1 : an attitude of doubt or a disposition to incredulity either in general or toward a particular object. 2a : the doctrine that true knowledge or knowledge in a particular area is uncertain.

What is a Contextualist approach?

Contextualism, also known as epistemic contextualism, is a family of views in philosophy which emphasize the context in which an action, utterance, or expression occurs.

What is an abominable conjunction?

The abominable conjunction isn’t “S knows H, and believes ~BIV because it follows from H, but doesn’t know ~BIV”; it’s just “S knows H but doesn’t know ~BIV.” That infelicity doesn’t seem at all mitigated if – as is, surely, almost always the case – she doesn’t believe ~BIV because it follows from H.

Who invented radical skepticism?

In modern philosophy, two representatives of radical skepticism are Michel de Montaigne (most famously known for his skeptical remark, Que sçay-je ?, ‘What do I know?’ in Middle French; modern French Que sais-je ?) and David Hume (particularly as set out in A Treatise of Human Nature, Book 1: “Of the Understanding”).

What does the word epistemology means?

epistemology, the philosophical study of the nature, origin, and limits of human knowledge. The term is derived from the Greek epistēmē (“knowledge”) and logos (“reason”), and accordingly the field is sometimes referred to as the theory of knowledge.

What is closure philosophy?

A closure principle is a principle that claims that a certain category of object (typically a set) is closed relative to some function or operation or rule, in the sense that performing that operation on any member of the set always leads us to something already in the set.

What are epistemic principles?

1. Epistemic Principles. Two kinds: (a) Logical analysis (not definitions!) of important concepts (e.g., K à TB). (b) Principles of Rational Belief, including Principles of Rational Belief Change (e.g., It is irrational to have logically inconsistent beliefs.)

What is the brain in a vat scenario?

In philosophy, the brain in a vat (BIV) is a scenario used in a variety of thought experiments intended to draw out certain features of human conceptions of knowledge, reality, truth, mind, consciousness, and meaning.

What is knowledge according to Reliabilism?

Ramsey (1931) is often credited with the first articulation of a reliabilist account of knowledge. He claimed that knowledge is true belief that is certain and obtained by a reliable process. That idea lay more-or-less dormant until the 1960s, when reliabilist theories emerged in earnest.

What is the generality problem for reliabilism?

The Generality Problem for Reliabilism

Argues that reliability approaches to justification are severely defective. They fail even to assert a necessary and sufficient condition for justification, much less a correct condition, if they do not identify the bearers of reliability.

What is Gettier’s challenge to the classical analysis of knowledge?

The Gettier problem, in the field of epistemology, is a landmark philosophical problem concerning the understanding of descriptive knowledge. Attributed to American philosopher Edmund Gettier, Gettier-type counterexamples (called “Gettier-cases”) challenge the long-held justified true belief (JTB) account of knowledge.