Step |
Hyp |
Ref |
Expression |
1 |
|
renegcl |
|
2 |
|
reflcl |
|
3 |
1 2
|
syl |
|
4 |
3
|
recnd |
|
5 |
|
ax-1cn |
|
6 |
|
negdi |
|
7 |
4 5 6
|
sylancl |
|
8 |
4
|
negcld |
|
9 |
|
negsub |
|
10 |
8 5 9
|
sylancl |
|
11 |
7 10
|
eqtr2d |
|
12 |
|
peano2re |
|
13 |
3 12
|
syl |
|
14 |
|
flltp1 |
|
15 |
1 14
|
syl |
|
16 |
15
|
adantr |
|
17 |
|
ltnegcon1 |
|
18 |
16 17
|
mpbid |
|
19 |
13 18
|
mpdan |
|
20 |
11 19
|
eqbrtrd |
|