JayKayElle™All games Counterexample!

Claim Investigation Bureau

Counterexample!

One case can change the answer.

Read each claim. Check which cases count and what rules they must meet. Then look at the proof.

Investigator’s field guide

Claims and evidence

Always

The claim works for every allowed case. A proof must check them all.

Sometimes

You need one true case and one false case.

Never

No permitted case satisfies the claim.

Counterexample

One permitted case that shows an “always” claim is false.

Domain

The complete collection of cases the claim is about.

Proof

A proof gives reasons for each case. Examples alone are not enough.

Settings

Reset progress?

This clears finished cases. Your Casebook and settings stay safe.

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