Claim Investigation Bureau
Counterexample!
One case can change the answer.
Read each claim closely. Check its domain, test its conditions, and decide what the evidence really shows.
Choose an investigation
Station Map
Case files show ideas you have explored, not grades or scores.
Investigation
New claim
Investigation workspace
What does the evidence show?
Controlled claim workshop
Create a Claim
Build a precise claim, test a bounded range, and revise it if a counterexample appears.
Every multiple of 6 is a multiple of 3.
Domain: whole numbers. Range tested: 0 through 120.
Ideas worth keeping
Casebook
Save investigations and reasoning—not points.