Nuprl - Proof: eq rat trans 1 1 1 1 1 1 1 1 1 1

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At: eq rat trans 1 1 1 1 1 1 1 1 1 1

1. x1 :

2. x2 :

3. y1 :

4. y2 :

5. z1 :

6. z2 :

7. x1

y2 = 0
8. 0 = y2

z1
9. x1

z2 = y1

y2
10. y1 = 0

z2 = z1

By:	FwdThru Thm* a,b:. ab = 0 a = 0 b = 0 [7]

Generated subgoal:

1 11. x1 = 0 y2 = 0
x1z2 = z1x2
3 steps

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