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| Description: Lemma for 3OA (weak) orthoarguesian law. |
| Ref | Expression |
|---|---|
| 3oalem1.1 |
|
| 3oalem1.2 |
|
| 3oalem1.3 |
|
| 3oalem1.4 |
|
| Ref | Expression |
|---|---|
| 3oalem1 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eleq1 1149 |
. . . . . 6
| |
| 2 | ax-hvaddcl 4984 |
. . . . . 6
| |
| 3 | 1, 2 | syl5bir 184 |
. . . . 5
|
| 4 | 3 | com12 13 |
. . . 4
|
| 5 | 4 | imdistani 340 |
. . 3
|
| 6 | 3oalem1.1 |
. . . . 5
| |
| 7 | 6 | chel 5137 |
. . . 4
|
| 8 | 3oalem1.3 |
. . . . 5
| |
| 9 | 8 | chel 5137 |
. . . 4
|
| 10 | 7, 9 | anim12i 268 |
. . 3
|
| 11 | 5, 10 | sylan 343 |
. 2
|
| 12 | 3oalem1.2 |
. . . . 5
| |
| 13 | 12 | chel 5137 |
. . . 4
|
| 14 | 3oalem1.4 |
. . . . 5
| |
| 15 | 14 | chel 5137 |
. . . 4
|
| 16 | 13, 15 | anim12i 268 |
. . 3
|
| 17 | 16 | adantr 306 |
. 2
|
| 18 | 11, 17 | anim12i 268 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: 3oalem2 5553 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-14 805 ax-16 922 ax-17 925 ax-ext 1074 ax-rep 1075 ax-hilex 4983 ax-hvaddcl 4984 |
| This theorem depends on definitions: df-bi 128 df-an 198 df-ex 679 df-sb 853 df-clab 1093 df-cleq 1097 df-clel 1099 df-ral 1205 df-v 1349 df-in 1491 df-ss 1492 df-sh 5114 df-ch 5127 |