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At: quotient of nsubn 1 1 1 1 2 1 2 1

1. E: 11Prop
2. EquivRel x,y:1. x E y
3. x,y:1. Dec(x E y)
4. 0 i,j:1//(i E j)
5. x: i,j:1//(i E j)

0 = x

By:
Analyze 5
THEN
Analyze


Generated subgoal:

15. x1: 1
6. x2: 1
7. x1 E x2
0 E x2


About:
equalquotientnatural_numberfunctionpropallmember