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| Description: 0 is a real number. Proved without referencing 1re 5447. (Contributed by Eric Schmidt, 21-May-2007.) |
| Ref | Expression |
|---|---|
| 0re |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0cn 5340 |
. . . 4
| |
| 2 | axcnre 5298 |
. . . 4
| |
| 3 | 1, 2 | ax-mp 7 |
. . 3
|
| 4 | df-rex 1653 |
. . . 4
| |
| 5 | pm3.26 319 |
. . . . 5
| |
| 6 | 5 | 19.22i 1042 |
. . . 4
|
| 7 | 4, 6 | sylbi 199 |
. . 3
|
| 8 | 3, 7 | ax-mp 7 |
. 2
|
| 9 | axrnegex 5295 |
. . . 4
| |
| 10 | pm3.27 323 |
. . . . . . 7
| |
| 11 | axaddrcl 5284 |
. . . . . . . 8
| |
| 12 | 11 | adantr 391 |
. . . . . . 7
|
| 13 | 10, 12 | eqeltrrd 1552 |
. . . . . 6
|
| 14 | 13 | ex 373 |
. . . . 5
|
| 15 | 14 | r19.23adva 1750 |
. . . 4
|
| 16 | 9, 15 | mpd 26 |
. . 3
|
| 17 | 16 | 19.23aiv 1297 |
. 2
|
| 18 | 8, 17 | ax-mp 7 |
1
|