Description: Lemma 2 for estrres . (Contributed by AV, 14-Mar-2020)
Ref | Expression | ||
---|---|---|---|
Hypotheses | estrres.c | |
|
estrres.b | |
||
estrres.h | |
||
estrres.x | |
||
Assertion | estrreslem2 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | estrres.c | |
|
2 | estrres.b | |
|
3 | estrres.h | |
|
4 | estrres.x | |
|
5 | eqidd | |
|
6 | 5 | 3mix1d | |
7 | fvex | |
|
8 | eltpg | |
|
9 | 7 8 | mp1i | |
10 | 6 9 | mpbird | |
11 | df-tp | |
|
12 | 11 | a1i | |
13 | 12 | dmeqd | |
14 | dmun | |
|
15 | 14 | a1i | |
16 | dmpropg | |
|
17 | 2 3 16 | syl2anc | |
18 | dmsnopg | |
|
19 | 4 18 | syl | |
20 | 17 19 | uneq12d | |
21 | 13 15 20 | 3eqtrd | |
22 | 1 | dmeqd | |
23 | df-tp | |
|
24 | 23 | a1i | |
25 | 21 22 24 | 3eqtr4d | |
26 | 10 25 | eleqtrrd | |