This is an inofficial mirror of http://metamath.tirix.org for personal testing of a visualizer extension only.
Description: The indexed union of set exponentiations is a subset of the set exponentiation of the indexed union. (Contributed by Glauco Siliprandi, 3-Mar-2021)
| Ref | Expression | ||
|---|---|---|---|
| Hypotheses | iunmapss.x | |- F/ x ph |
|
| iunmapss.a | |- ( ph -> A e. V ) |
||
| iunmapss.b | |- ( ( ph /\ x e. A ) -> B e. W ) |
||
| Assertion | iunmapss | |- ( ph -> U_ x e. A ( B ^m C ) C_ ( U_ x e. A B ^m C ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | iunmapss.x | |- F/ x ph |
|
| 2 | iunmapss.a | |- ( ph -> A e. V ) |
|
| 3 | iunmapss.b | |- ( ( ph /\ x e. A ) -> B e. W ) |
|
| 4 | 3 | ex | |- ( ph -> ( x e. A -> B e. W ) ) |
| 5 | 1 4 | ralrimi | |- ( ph -> A. x e. A B e. W ) |
| 6 | iunexg | |- ( ( A e. V /\ A. x e. A B e. W ) -> U_ x e. A B e. _V ) |
|
| 7 | 2 5 6 | syl2anc | |- ( ph -> U_ x e. A B e. _V ) |
| 8 | 7 | adantr | |- ( ( ph /\ x e. A ) -> U_ x e. A B e. _V ) |
| 9 | ssiun2 | |- ( x e. A -> B C_ U_ x e. A B ) |
|
| 10 | 9 | adantl | |- ( ( ph /\ x e. A ) -> B C_ U_ x e. A B ) |
| 11 | mapss | |- ( ( U_ x e. A B e. _V /\ B C_ U_ x e. A B ) -> ( B ^m C ) C_ ( U_ x e. A B ^m C ) ) |
|
| 12 | 8 10 11 | syl2anc | |- ( ( ph /\ x e. A ) -> ( B ^m C ) C_ ( U_ x e. A B ^m C ) ) |
| 13 | 12 | ex | |- ( ph -> ( x e. A -> ( B ^m C ) C_ ( U_ x e. A B ^m C ) ) ) |
| 14 | 1 13 | ralrimi | |- ( ph -> A. x e. A ( B ^m C ) C_ ( U_ x e. A B ^m C ) ) |
| 15 | nfiu1 | |- F/_ x U_ x e. A B |
|
| 16 | nfcv | |- F/_ x ^m |
|
| 17 | nfcv | |- F/_ x C |
|
| 18 | 15 16 17 | nfov | |- F/_ x ( U_ x e. A B ^m C ) |
| 19 | 18 | iunssf | |- ( U_ x e. A ( B ^m C ) C_ ( U_ x e. A B ^m C ) <-> A. x e. A ( B ^m C ) C_ ( U_ x e. A B ^m C ) ) |
| 20 | 14 19 | sylibr | |- ( ph -> U_ x e. A ( B ^m C ) C_ ( U_ x e. A B ^m C ) ) |