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Also, "all x are y" presupposes the existence of an x in Aristotelian logic.

• ogogmad 4y ago
  No. By "x" I mean some predicate. For instance, x is "men".
  • macrolocal 4y ago
    Yes. You can read more about the particular issue I'm raising here: https://philosophy.stackexchange.com/questions/42291/does-this-syllogism-by-russell-show-that-aristotelian-logic-doesnt-work https://philosophy.stackexchange.com/questions/42291/does-th... In particular, one reads premises with existential import, slightly at odds with modern usage.
    • ogogmad 4y ago
      Oh, that's interesting. Thank you.