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material fallacies

Argumentum ad Populam (Popular Appeal)

October 27, 2020 by The Philosurfer Leave a Comment

The 'argumentum ad populum' fallacy assumes that probability of a belief is increased by the number of people that believe it. This video explores interesting examples of this, especially in democracy.

NOTES

  • argumentum ad populam- assuming that a lot of people believing something is a good reason to think it is more probably true
    • Arguments that this is fallacious reasoning
      • A1: psychological similarity
      • A2: gaslighting
      • A3: groupthink
      • A4: Mandela effect
  • argumentum contra populum- assuming that a lot of people believing something is a good reason to think it is less probably true

Further Reading

A pretty nice list of notes can be found here, though as you might be able to tell from the video I don't really agree with a lot of what is said there.

I also really liked this blog post, especially the discussion on Zeno and calculus (it was a little off topic--but, I mean, I made an entire career by being off topic)

My favorite logic book that deals with material fallacies is Peter Kreeft's Socratic Logic, and I like his discussion of the ad populum, though it's unfortunately short.

Filed Under: Material Fallacies Tagged With: ad populum, informal fallacies, logic, material fallacies, popular appeal

Begging the Question

April 5, 2020 by The Philosurfer Leave a Comment

'Begging the question' (also 'petitio principii') is an informal fallacy of reasoning. In this video, I'll explain what it is, how it relates to circular reasoning, tips on avoiding it, and some common mistakes about it.

NOTES

Here's an example of "begs the question" used incorrectly in a DC Justice League comic by The Flash

Further Reading

Aristotle talks about this in Sophistical Refutations and in Prior Analytics book II.

Whatley's Elements of Logic is interesting for historical reasons, but there are much better logic books now. Read it for free online here. Don't buy it unless you like artifacts.

René Descartes' Meditations on First Philosophy for free here, or get a more recent translation here

 

Filed Under: Material Fallacies Tagged With: begging the question, begs the question, informal fallacies, logic, material fallacies