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At: incl aux4 quo 1 1 1 2

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

By: Assert (x2 = n-1)

Generated subgoals:

1 x2 = n-1 n
29. x2 = n-1 n
x2 < n-1


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less_thansubtractnatural_numberequalfunctionpropquotient