INTRODUCTORY-CHALLENGE-PROBLEM-2.html -- ACL2 Version 6.3

### INTRODUCTORY-CHALLENGE-PROBLEM-2

challenge problem 2 for the new user of ACL2

    Major Section:  INTRODUCTION-TO-THE-THEOREM-PROVER

Start in a fresh ACL2, either by restarting your ACL2 image from scratch or executing `:ubt! 1`.

Use The Method to prove

    (defthm subsetp-reflexive
      (subsetp x x))

When you've solved this problem, compare your answer to ours; see introductory-challenge-problem-2-answer.

Then, use your browser's Back Button to return to introductory-challenges.