At: mn 23 2 2
1. n: {1...}
2. A: Type
3. L: LangOver(A)
4. L 
A*
Prop
5. R: A*A*Prop
6. Fin(A)
7. EquivRel x,y:A*. x R y
8. 
n ~ (x,y:A*//(x R y))
9. 
x,y,z:A*. (x R y) 
((z @ x) R (z @ y))
10. g: (x,y:A*//(x R y))
11. l:A*. L(l) 
g(l)
12. l: A*
Dec(L(l))
By: RWO "11" 0
Generated subgoals:None
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