Logic and Proof

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Across
  1. 2. formed by negating and switching the hypothesis and conclusion
  2. 4. formed by switching the hypothesis and conclusion
  3. 5. a sentence that is either true or false
  4. 6. an example showing a conjecture is false
  5. 7. statements joined by the word "or"
  6. 8. formed by negating the hypothesis and conclusion
  7. 9. a statement written in if-then form
  8. 11. reasoning making a conclusion based on observation or patterns
Down
  1. 1. statements joined by the word "and"
  2. 3. a statement with the phrase "if and only if"
  3. 6. a concluding statement
  4. 10. a statement with opposite truth value