None
Conclusion:
n:{1...}. A:. R:A A . 1-1-Corresp(n;A) EquivRel(A;x,y.x R y) (x,y:A. Dec(x R y)) (m:(n + 1). 1-1-Corresp(m;x,y:A//(x R y)))
1. m:(n + 1). 1-1-Corresp(m;x,y:A//(x R y))