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Practice

Complete a deduction review

Order the complete workflow for deciding whether a conclusion is guaranteed.

Deduction chain

Preserve direction from premises to conclusion

  1. PremisesSeparate facts and rules
  2. DirectionMark if, only, all, and some
  3. ConnectLink matching terms
  4. ChallengeTry a counterexample
  5. ConcludeState only what is guaranteed

A guaranteed conclusion follows only when stated facts activate rules in their written direction and no counterexample survives.

Arrange in the correct order
  1. 1. State guaranteed, possible, impossible, or unknown
  2. 2. Try to construct a counterexample
  3. 3. Connect facts that share the required term
  4. 4. Mark universal and if-then direction
  5. 5. List every supplied premise separately