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| Description: Derivation of 4-OA law variant. |
| Ref | Expression |
|---|---|
| oa4btoc.1 |
|
| Ref | Expression |
|---|---|
| oa4btoc |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | leo 150 |
. . . 4
| |
| 2 | df-i1 43 |
. . . . 5
| |
| 3 | 2 | ax-r1 34 |
. . . 4
|
| 4 | 1, 3 | lbtr 131 |
. . 3
|
| 5 | leid 140 |
. . . . . 6
| |
| 6 | 5 | lelor 158 |
. . . . 5
|
| 7 | 6 | lelan 159 |
. . . 4
|
| 8 | 7 | lelor 158 |
. . 3
|
| 9 | 4, 8 | le2an 161 |
. 2
|
| 10 | oa4btoc.1 |
. 2
| |
| 11 | 9, 10 | letr 129 |
1
|
| Colors of variables: term |
| Syntax hints: |
| This theorem was proved from axioms: ax-a1 29 ax-a2 30 ax-a3 31 ax-a5 33 ax-r1 34 ax-r2 35 ax-r4 36 ax-r5 37 |
| This theorem depends on definitions: df-a 39 df-t 40 df-f 41 df-i1 43 df-le1 122 df-le2 123 |