1 | 1. T: Type 2. R1: T T Prop 3. R2: T T Prop 4. x,y:T. R1(x,y)  R2(x,y) Id {p:(T T)| R1(1of(p),2of(p)) } {p:(T T)| R2(1of(p),2of(p)) } | 1 step |
  |
2 | 1. T: Type 2. R1: T T Prop 3. R2: T T Prop 4. x,y:T. R1(x,y)  R2(x,y) Bij({p:(T T)| R1(1of(p),2of(p)) }; {p:(T T)| R2(1of(p),2of(p)) }; Id) | 5 steps |
  |
3 | 1. T: Type 2. R1: T T Prop 3. R2: T T Prop 4. x,y:T. R1(x,y)  R2(x,y) (Id,Id) o Id = Id o Id {p:(T T)| R1(1of(p),2of(p)) } T T | 1 step |