$\"\"$

If $\"\"$ , then $\"\"$ must be equal to $\"\"$ .

Hypothesis: If $\"\"$ .

The hypothesis is true.

Conclusion: then $\"\"$ must be equal to $\"\"$ .

The conclusion is false.

The stament is false.

Counterexample:

If $\"\"$ then $\"\"$ .

$\"\"$

The stament is true.

If $\"\"$ then $\"\"$ .