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| Description: 0 is a real number. Proved without referencing 1re 6394. (Contributed by Eric Schmidt, 21-May-2007.) |
| Ref | Expression |
|---|---|
| 0re |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0cn 6277 |
. . . 4
| |
| 2 | axcnre 6235 |
. . . 4
| |
| 3 | 1, 2 | ax-mp 7 |
. . 3
|
| 4 | df-rex 1944 |
. . . 4
| |
| 5 | exsimpl 1299 |
. . . 4
| |
| 6 | 4, 5 | sylbi 215 |
. . 3
|
| 7 | 3, 6 | ax-mp 7 |
. 2
|
| 8 | axrnegex 6232 |
. . . 4
| |
| 9 | pm3.27 348 |
. . . . . . 7
| |
| 10 | readdcl 6251 |
. . . . . . . 8
| |
| 11 | 10 | adantr 423 |
. . . . . . 7
|
| 12 | 9, 11 | eqeltrrd 1809 |
. . . . . 6
|
| 13 | 12 | ex 400 |
. . . . 5
|
| 14 | 13 | r19.23adva 2050 |
. . . 4
|
| 15 | 8, 14 | mpd 29 |
. . 3
|
| 16 | 15 | 19.23aiv 1512 |
. 2
|
| 17 | 7, 16 | ax-mp 7 |
1
|