Aumann's agreement theorem
Aumann's agreement theorem, roughly speaking, says that two agents acting rationally (in a certain precise sense) and with common knowledge of each other's beliefs cannot agree to disagree. More specifically, if two people are genuine Bayesians, share common priors, and have common knowledge of each other's current probability assignments, then they must have equal probability assignments.
- Agreeing to Agree by Hal Finney
- The Proper Use of Humility by Eliezer Yudkowsky
- The Coin Guessing Game by Hal Finney - A toy problem illustrating the mechanics of Aumann agreement.