Step * 2 2 of Lemma agree_on_common_iseg


1. [T] Type
2. T
3. List
4. ∀bs2,as1,bs1:T List.  (as1 ≤  bs1 ≤ bs2  agree_on_common(T;v;bs2)  agree_on_common(T;as1;bs1))
5. u1 T
6. v1 List
7. ∀as1,bs1:T List.  (as1 ≤ [u v]  bs1 ≤ v1  agree_on_common(T;[u v];v1)  agree_on_common(T;as1;bs1))
⊢ ∀as1,bs1:T List.
    (as1 ≤ [u v]  bs1 ≤ [u1 v1]  agree_on_common(T;[u v];[u1 v1])  agree_on_common(T;as1;bs1))
BY
InductionOnList }

1
1. [T] Type
2. T
3. List
4. ∀bs2,as1,bs1:T List.  (as1 ≤  bs1 ≤ bs2  agree_on_common(T;v;bs2)  agree_on_common(T;as1;bs1))
5. u1 T
6. v1 List
7. ∀as1,bs1:T List.  (as1 ≤ [u v]  bs1 ≤ v1  agree_on_common(T;[u v];v1)  agree_on_common(T;as1;bs1))
⊢ ∀bs1:T List. ([] ≤ [u v]  bs1 ≤ [u1 v1]  agree_on_common(T;[u v];[u1 v1])  agree_on_common(T;[];bs1))

2
1. [T] Type
2. T
3. List
4. ∀bs2,as1,bs1:T List.  (as1 ≤  bs1 ≤ bs2  agree_on_common(T;v;bs2)  agree_on_common(T;as1;bs1))
5. u1 T
6. v1 List
7. ∀as1,bs1:T List.  (as1 ≤ [u v]  bs1 ≤ v1  agree_on_common(T;[u v];v1)  agree_on_common(T;as1;bs1))
8. u2 T
9. v2 List
10. ∀bs1:T List. (v2 ≤ [u v]  bs1 ≤ [u1 v1]  agree_on_common(T;[u v];[u1 v1])  agree_on_common(T;v2;bs1))
⊢ ∀bs1:T List
    ([u2 v2] ≤ [u v]  bs1 ≤ [u1 v1]  agree_on_common(T;[u v];[u1 v1])  agree_on_common(T;[u2 v2];bs1))


Latex:


Latex:

1.  [T]  :  Type
2.  u  :  T
3.  v  :  T  List
4.  \mforall{}bs2,as1,bs1:T  List.
          (as1  \mleq{}  v  {}\mRightarrow{}  bs1  \mleq{}  bs2  {}\mRightarrow{}  agree\_on\_common(T;v;bs2)  {}\mRightarrow{}  agree\_on\_common(T;as1;bs1))
5.  u1  :  T
6.  v1  :  T  List
7.  \mforall{}as1,bs1:T  List.
          (as1  \mleq{}  [u  /  v]  {}\mRightarrow{}  bs1  \mleq{}  v1  {}\mRightarrow{}  agree\_on\_common(T;[u  /  v];v1)  {}\mRightarrow{}  agree\_on\_common(T;as1;bs1))
\mvdash{}  \mforall{}as1,bs1:T  List.
        (as1  \mleq{}  [u  /  v]
        {}\mRightarrow{}  bs1  \mleq{}  [u1  /  v1]
        {}\mRightarrow{}  agree\_on\_common(T;[u  /  v];[u1  /  v1])
        {}\mRightarrow{}  agree\_on\_common(T;as1;bs1))


By


Latex:
InductionOnList




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