Questions: Coherence and Mutual Support

Question 1

System A = {'The Earth is round,' 'Satellites orbit Earth,' 'GPS works via satellite triangulation,' 'GPS requires accurate Earth-shape models'} — each belief explains or supports the others. System B = {'The Eiffel Tower is in Paris,' 'Prime numbers are infinite,' 'Whales are mammals'} — all true but unrelated. Which is more coherent in the epistemological sense?

• A. System B, because all its beliefs are definitely true
• B. System A, because its beliefs are interconnected by inferential relationships
• C. They are equally coherent, since both systems are internally consistent
• D. System A, simply because it has more beliefs

Answer: (B)

Coherence requires positive inferential relationships, not just consistency. System B's beliefs are true and non-contradictory but have no explanatory connections to each other. System A's beliefs mutually explain and support one another. That web of mutual support is what coherentism requires for justification.

Question 2

A detective's theory perfectly explains all available evidence — every clue fits, every loose end is resolved. But the theory is wrong; the actual culprit was someone else. This scenario:

• A. Refutes coherentism entirely, since coherence failed to ensure truth
• B. Illustrates the isolation objection — coherence provides relative justification but does not guarantee truth
• C. Proves coherentism requires direct sensory evidence to function
• D. Shows that mutual support is insufficient for genuine coherence

Answer: (B)

The detective scenario is the classic isolation objection to coherentism. Coherentists respond by distinguishing justification from truth: coherence provides the best available justification without guaranteeing correspondence with reality. The most coherent system is the most justified, not necessarily the true one.

Question 3

In a coherentist system, a belief can be justified even if no single other belief provides definitive evidence for it, as long as the overall web of beliefs mutually supports it.

• T. True
• F. False

Answer: True

This is coherentism's central claim. Justification is systemic — it emerges from the entire pattern of inferential relationships, not from any single foundational source. A belief is well-justified when many other beliefs support it, when it in turn explains others, and when removing it would weaken the system's overall explanatory power.

Question 4

Coherentism allows any internally consistent set of beliefs to count as justified, regardless of how they relate to experience.

• T. True
• F. False

Answer: False

This is a common mischaracterization. Coherentists do not claim mere internal consistency suffices — most coherentists recognize that a belief system must engage with perception and experience to be genuinely coherent. Furthermore, coherence requires positive inferential connections, not just the absence of contradiction.

Question 5

What is the difference between consistency and coherence, and why does coherentism require the stronger condition?

Model answer: Consistency means a set of beliefs contains no contradictions — none entail the falsity of any other. Coherence additionally requires positive inferential relationships: beliefs that explain, confirm, predict, or support each other. Coherentism requires the stronger condition because mere consistency would make justification too cheap — any arbitrary collection of non-contradictory beliefs would count as a justified system, even if the beliefs had nothing to do with each other.

The distinction is between beliefs that happen not to conflict and beliefs that actively support each other. Coherentism grounds justification in the latter: a belief is justified because removing it would cost the system explanatory power and because it receives support from multiple inferential directions throughout the web.