Description: Double substitution lemma for mzPolyCld . (Contributed by Stefan O'Rear, 4-Oct-2014)
Ref | Expression | ||
---|---|---|---|
Assertion | elmzpcl | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | mzpclval | |
|
2 | 1 | eleq2d | |
3 | eleq2 | |
|
4 | 3 | ralbidv | |
5 | eleq2 | |
|
6 | 5 | ralbidv | |
7 | 4 6 | anbi12d | |
8 | eleq2 | |
|
9 | eleq2 | |
|
10 | 8 9 | anbi12d | |
11 | 10 | raleqbi1dv | |
12 | 11 | raleqbi1dv | |
13 | 7 12 | anbi12d | |
14 | 13 | elrab | |
15 | ovex | |
|
16 | 15 | elpw2 | |
17 | 16 | anbi1i | |
18 | 14 17 | bitri | |
19 | 2 18 | bitrdi | |