Logical, technical, and physical impossibilities, which is which?

1
Logical, technical, and physical impossibilities,
which is which?

• Build a computer with 5GHz clock speed.
• Draw a triangle with internal angles of 200
  degrees.
• To be 300 years of age.

2
Distinguish between valid and invalid

• All cats are animals.
• All dogs are animals.
• Therefore, all cats are dogs.
• All students are clever.
• All clever persons are happy.
• Therefore, all students are happy.

3
Distinguish between sound and unsound

• Since Harry Porter was written by Anson Chan, and
  Harry Porter is a text book, it follows that
  Anson Chan wrote a text book.
• Since London is north of Paris and south of North
  Pole, it follows that Paris is south of North
  Pole.

4
Distinguish between strong and weak inductive
arguments

• Most the patients with AIDS die within 10 years.
• Therefore, if you contracts AIDS, you will die
  within 10 years.
• Most of the cats with diarrhea die.
• Cats and men are both animals.
• Therefore, most of those men with diarrhea die.

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A list of T/F questions

• 1. Some arguments are almost valid.
• 2. All inductive arguments, if treated as
  deductive arguments, are invalid.
• 3. If a deductive argument has true premises and
  a false conclusion, it must be invalid.
• 4. A valid argument can have a false premise and
  a false conclusion.

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• 5. A valid argument can have a false premise and
  a true conclusion.
• 6. A sound argument may be invalid.
• 7. A sound argument may have a false conclusion.
• 8. A strong argument may have false premises and
  a probably false conclusion.

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• 9. A strong argument may have true premises and a
  probably false conclusion.
• 10. A cogent argument must be inductively strong.
• 11. If an argument has true premises and a true
  conclusion, it is a valid or a strong argument.
• 12. An argument may be true or false.