Step |
Hyp |
Ref |
Expression |
1 |
|
elfzoel1 |
|
2 |
1
|
adantr |
|
3 |
2
|
zred |
|
4 |
|
elfzoelz |
|
5 |
4
|
adantr |
|
6 |
5
|
zred |
|
7 |
|
simpr |
|
8 |
7
|
zred |
|
9 |
|
elfzole1 |
|
10 |
9
|
adantr |
|
11 |
3 6 8 10
|
leadd1dd |
|
12 |
|
elfzoel2 |
|
13 |
12
|
adantr |
|
14 |
13
|
zred |
|
15 |
|
elfzolt2 |
|
16 |
15
|
adantr |
|
17 |
6 14 8 16
|
ltadd1dd |
|
18 |
|
zaddcl |
|
19 |
4 18
|
sylan |
|
20 |
|
zaddcl |
|
21 |
1 20
|
sylan |
|
22 |
|
zaddcl |
|
23 |
12 22
|
sylan |
|
24 |
|
elfzo |
|
25 |
19 21 23 24
|
syl3anc |
|
26 |
11 17 25
|
mpbir2and |
|