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EPISTEMOLOGY: The Study of Knowledge

Defining Epistemology

The Scope of Inquiry

Epistemology is the branch of philosophy that investigates the nature, scope, and limits of knowledge. It addresses questions such as: What is knowledge? How is knowledge acquired? What do people know? How do we justify beliefs? Understanding epistemology is essential for assessing claims to knowledge in philosophy and across disciplines.

Core Epistemic Concepts

Understanding the foundational terminology is crucial before diving into theories of justification.

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Knowledge

Traditionally defined as "justified true belief" (JTB).
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Belief

Mental attitude where a person holds that a proposition is true.
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Truth

A proposition is true if it corresponds to reality or facts.
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Justification

The support or reasons that make holding a belief rational or reasonable.

The Standard Definition of Knowledge

Knowledge = Justified + True + Belief (JTB)
This classic account was famously challenged by Edmund Gettier (1963), who presented cases where all three conditions were met but it intuitively seemed wrong to say the person knew.

Models of Epistemic Justification

Epistemic justification theories explore how beliefs can be rationalized and supported. We examine four key models.

1

FOUNDATIONALISM

Knowledge rests on basic beliefs that are self-evident or evident to the senses.
2

COHERENTISM

Justification arises from the coherence of a system of beliefs in a mutually supportive network.
3

INFINITISM

Justification requires an infinite chain of reasons, avoiding circularity and arbitrary stopping points.
4

RELIABILISM

Justification depends on the reliability of the process that produces the belief (externalist theory).

Foundationalism: Pros and Critiques

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Strength Provides a clear structure to knowledge and avoids infinite regress of justification.
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Criticism What counts as a basic belief and how are they justified? Some argue foundationalism rests on arbitrary or unjustified assumptions.

Distinctions in Knowledge

Types of knowledge defined by their reliance on experience and their relationship to truth.

ID Type Source Condition Example
01 A Priori Reason Independent of experience All bachelors are unmarried
02 A Posteriori Senses Depends on experience The sky is blue
03 Analytic Definition True by definition Triangles have three sides
04 Synthetic Facts Truth depends on facts It is raining outside

Methods of Epistemic Reasoning

Type Description Aim
Deductive Arguments Conclusion necessarily follows from premises. Certainty
Inductive Arguments Conclusion is probable, based on empirical generalization. Probability
Abductive Arguments Inference to the best explanation (IBE). Best Explanation

The Justification Debate

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Wait, if a belief is formed reliably, but I don't know the reasons why, can I truly be justified? (Internalist View)
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The reliability of the process is enough! Justification depends on objective factors, not necessarily access to those reasons. (Externalist View)

Addressing the Gettier Challenge

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The Gettier Problem: Gettier cases show that having a JTB is insufficient for knowledge if the truth of the belief is due to luck, not the justification directly supporting it.

Primary Sources of Knowledge

Knowledge acquisition is rooted in several fundamental processes, including sensation and rationality.

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Perception

Knowledge gained through our senses. Empiricism holds that all knowledge begins with perception.
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Reason

Using logic and rational thought to gain knowledge without relying on sensory input; central to rationalism.
Epistemology Flashcards
Q
What is epistemology?

The branch of philosophy studying the nature, scope, and limits of knowledge.

A
Answer

The branch of philosophy studying the nature, scope, and limits of knowledge.

Q
Define knowledge in the traditional sense.

Justified true belief (JTB).

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Answer

Justified true belief (JTB).

Q
Who challenged the traditional JTB account of knowledge?

Edmund Gettier in 1963.

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Answer

Edmund Gettier in 1963.

Q
What are the three conditions for traditional knowledge?

(1) The proposition is true, (2) the person believes it, (3) the belief is justified.

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Answer

(1) The proposition is true, (2) the person believes it, (3) the belief is justified.

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What is belief?

A mental attitude of holding a proposition to be true.

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Answer

A mental attitude of holding a proposition to be true.

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What is the correspondence theory of truth?

Truth as matching or corresponding to reality or facts.

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Answer

Truth as matching or corresponding to reality or facts.

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What is justification?

The support or reasons that make a belief rational or reasonable.

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Answer

The support or reasons that make a belief rational or reasonable.

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What does skepticism question?

The possibility or extent of knowledge.

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Answer

The possibility or extent of knowledge.

Q
Name the four main theories of epistemic justification.

Foundationalism, Coherentism, Infinitism, Reliabilism.

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Answer

Foundationalism, Coherentism, Infinitism, Reliabilism.

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What is foundationalism?

The view that knowledge rests on basic self-evident or sensory beliefs that justify others.

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Answer

The view that knowledge rests on basic self-evident or sensory beliefs that justify others.

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What is coherentism?

Justification comes from the coherence of a network of mutually supporting beliefs.

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Answer

Justification comes from the coherence of a network of mutually supporting beliefs.

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What is infinitism?

Justification requires an infinite chain of reasons for each belief.

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Answer

Justification requires an infinite chain of reasons for each belief.

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What is reliabilism?

Justification depends on the reliability of the belief-forming process, regardless of internal awareness.

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Answer

Justification depends on the reliability of the belief-forming process, regardless of internal awareness.

Q
What are the main sources of knowledge?

Perception, introspection, reason, memory, testimony.

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Answer

Perception, introspection, reason, memory, testimony.

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Differentiate a priori from a posteriori knowledge.

A priori is independent of experience; a posteriori depends on experience.

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Answer

A priori is independent of experience; a posteriori depends on experience.

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What is the Gettier problem?

Cases where justified true belief does not constitute knowledge due to luck.

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Answer

Cases where justified true belief does not constitute knowledge due to luck.

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What is internalism in epistemology?

Justification depends on factors accessible to the believer's consciousness.

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Answer

Justification depends on factors accessible to the believer's consciousness.

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What is externalism in epistemology?

Justification can depend on factors outside the believer’s mental awareness, like reliability.

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Answer

Justification can depend on factors outside the believer’s mental awareness, like reliability.

Q
Name a key response to skepticism.

Contextualism, pragmatism, Moorean response, or fallibilism.

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Answer

Contextualism, pragmatism, Moorean response, or fallibilism.

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What is deductive reasoning?

Reasoning where conclusions necessarily follow from premises.

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Answer

Reasoning where conclusions necessarily follow from premises.

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What is inductive reasoning?

Reasoning based on generalizing from experience; conclusions are probable but not certain.

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Answer

Reasoning based on generalizing from experience; conclusions are probable but not certain.

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What is abductive reasoning?

Inferring the best explanation for given evidence.

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Answer

Inferring the best explanation for given evidence.

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📚 Epistemology Quiz

1. What are the three conditions traditionally required for knowledge?

Traditional knowledge is defined as justified true belief (JTB).

2. Which philosopher is known for challenging the JTB definition of knowledge?

Gettier presented cases in 1963 showing that JTB isn’t sufficient for knowledge.

3. Which theory claims that justification depends on the coherence of a belief system?

Coherentism holds that beliefs are justified if they fit coherently within a system of beliefs.

4. According to reliabilism, what determines whether a belief is justified?

Reliabilism emphasizes external factors; a belief is justified if it results from a reliable method.

5. Which source of knowledge does empiricism emphasize as primary?

Empiricism holds that knowledge originates from sensory experience.

6. What distinguishes a priori knowledge from a posteriori knowledge?

A priori knowledge is independent of sensory input; a posteriori is derived from experience.

7. What is a primary concern of philosophical skepticism?

Skeptics question the possibility and extent of certain or any knowledge.

📊 Results

  • Notes and Quiz
  • PHILOSOPHY
  • A Level
  • Epistemology
  • AQA