eq)L4
nil(eq)L2 
(nil @ L3)(eq)(L2 @ L4)eq)L413. u: T
14. v: T List
15. v(
eq)L2 (v @ L3)(eq)(L2 @ L4) (u.v)(eq)L2 ((u.v) @ L3)(eq)(L2 @ L4)
}
T
T
x:T. eq(x,x)
x,y:T. eq(x,y) 
eq(y,x)
x,y,z:T. eq(x,y) eq(y,z) eq(x,z)
eq)L2
eq)L4
(L1 @ L3)(eq)(L2 @ L4)
| 1 | 12. L3(eq)L4 nil(eq)L2 (nil @ L3)(eq)(L2 @ L4) |
| 2 | 12. L3(eq)L4 13. u: T 14. v: T List 15. v( eq)L2 (v @ L3)(eq)(L2 @ L4) (u.v)(eq)L2 ((u.v) @ L3)(eq)(L2 @ L4) |
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