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At: incl aux4 quo 1

1. n: {1...}
2. E: nnProp
3. EquivRel i,j:n. i E j
4. x: i,j:n//(i E j)
5. x = n-1 i,j:n//(i E j)

x i,j:(n-1)//(i E j)

By: Inst Thm* n:{1...}, m:n, E:(nnProp). (EquivRel x,y:n. x E y) (EquivRel x,y:m. x E y) [n;n-1;E]

Generated subgoal:

16. EquivRel x,y:(n-1). x E y
x i,j:(n-1)//(i E j)


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