Description: Equality deduction for indexed unions. (Contributed by Giovanni Mascellani, 10-Apr-2018)
Ref | Expression | ||
---|---|---|---|
Hypotheses | iuneq12f.1 | |- F/_ x A |
|
iuneq12f.2 | |- F/_ x B |
||
Assertion | iuneq12f | |- ( ( A = B /\ A. x e. A C = D ) -> U_ x e. A C = U_ x e. B D ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | iuneq12f.1 | |- F/_ x A |
|
2 | iuneq12f.2 | |- F/_ x B |
|
3 | iuneq2 | |- ( A. x e. A C = D -> U_ x e. A C = U_ x e. A D ) |
|
4 | 1 2 | iuneq2f | |- ( A = B -> U_ x e. A D = U_ x e. B D ) |
5 | 3 4 | sylan9eqr | |- ( ( A = B /\ A. x e. A C = D ) -> U_ x e. A C = U_ x e. B D ) |