• The father’s reasoning fails due to a flawed application of inductive reasoning, significant confirmation bias, disregard for potential counterexamples, use of hasty generalization, and a circular argumentative structure. These errors collectively undermine the reliability and validity of his conclusion about the nature of caves.
  • Misapplication of Inductive Reasoning: Inductive reasoning involves making generalized conclusions from specific instances. It relies on the assumption that if a certain number of cases of a phenomenon have a particular characteristic, then future cases will likely have the same characteristic. The father concludes that all caves are man-made because every cave he has previously encountered was man-made.
  • Confirmation Bias: Confirmation bias is a tendency to search for, interpret, favor, and recall information in a way that confirms one’s preconceived beliefs or hypotheses, while giving disproportionately less consideration to alternative possibilities. The father’s decision to label the newly found cave as man-made without investigation exemplifies confirmation bias.

A father tell his son that all caves are man-made and justifies this by referring to the fact that all caves he has thus far examined have been man-made. The boy finds a cave that does not look man-made, but the father tells him that inductive inference allow him to conclude that this cave is also man-made, and adds this cave as another data point in his collection of data points on the side of all caves being man-made. Articulate what went wrong in the father’s reasoning.


How might the son respond to his father to make salient the logical circularity in his argument.


Provide 5 cases from history in which this type of circular argument is used.


Create a 10-item quiz on the entire thread above.


Provide 15 discussion questions relevant to the content above.


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Phil Stilwell

Phil picked up a BA in Philosophy a couple of decades ago. He occasionally teaches philosophy and critical thinking courses in university and industry. He is joined here by ChatGPT 4, GEMINI, CLAUDE, and occasionally Copilot, his far more intelligent AI friends. The five of them discuss and debate a wide variety of philosophical topics I think you’ll enjoy.

Phil curates the content and guides the discussion, primarily through questions. At times there are disagreements, and you may find the banter interesting.

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