Philosophy class today
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Professor:
If you say, "All humans are mortal; Steve is a human, therefore Steve is mortal," your argument is valid. Whereas, if you say, "All humans are mortal; Steve is tall, therefore Steve is mortal," your argument would not be so valid.
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Student:
Steve could be a giraffe.
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Professor:
Steve could be a giraffe. Steve could be a building. A building named Steve.