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

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At: eq rat trans 1 1 1 1 1 1

1. x1 :

2. x2 :

3. y1 :

4. y2 :

5. z1 :

6. z2 :

7. x1

y2 = y1

x2
8. y1

z2 = z1

By:	FwdThru Thm* i1,i2,j1,j2:. i1 = j1 i2 = j2 i1i2 = j1j2 [7;8]

Generated subgoal:

1 9. x1y2y1z2 = y1x2z1y2
x1z2 = z1x2
10 steps

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