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At: incl aux4 quo 1 1 1 2 1

1. n: {1...}
2. E: nnProp
3. EquivRel i,j:n. i E j
4. x1: n
5. x2: n
6. x1 E x2
7. x1 = n-1 i,j:n//(i E j)
8. EquivRel x,y:(n-1). x E y

x2 = n-1 n

By:
Analyze 0
THEN
HypSubst -1 6
THEN
Analyze 7


Generated subgoal:

16. x1 E (n-1)
7. EquivRel x,y:(n-1). x E y
8. x2 = n-1 n
x1 = n-1 i,j:n//(i E j)


About:
equalnatural_numbersubtractfunctionpropquotient