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Keywords:

  • counterexample;
  • formal validity;
  • hypothetical syllogism;
  • indicative conditional

In this article, I present a schema for generating counterexamples to the argument form known as Hypothetical Syllogism (HS) with indicative conditionals. If my schema for generating counterexamples to HS works as I think it does, then HS is invalid for indicative conditionals.