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| Mirrors > Home > MPE Home > Th. List > 7cn | Structured version Visualization version GIF version | ||
| Description: The number 7 is a complex number. (Contributed by David A. Wheeler, 8-Dec-2018.) Reduce dependencies on axioms. (Revised by Steven Nguyen, 4-Oct-2022.) |
| Ref | Expression |
|---|---|
| 7cn | ⊢ 7 ∈ ℂ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-7 12403 | . 2 ⊢ 7 = (6 + 1) | |
| 2 | 6cn 12427 | . . 3 ⊢ 6 ∈ ℂ | |
| 3 | ax-1cn 11251 | . . 3 ⊢ 1 ∈ ℂ | |
| 4 | 2, 3 | addcli 11308 | . 2 ⊢ (6 + 1) ∈ ℂ |
| 5 | 1, 4 | eqeltri 2857 | 1 ⊢ 7 ∈ ℂ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2145 (class class class)co 7418 ℂcc 11191 1c1 11194 + caddc 11196 6c6 12394 7c7 12395 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2733 ax-1cn 11251 ax-addcl 11253 |
| This proof depends on definitions: df-bi 210 df-an 402 df-ex 1813 df-cleq 2753 df-clel 2836 df-2 12398 df-3 12399 df-4 12400 df-5 12401 df-6 12402 df-7 12403 |
| This theorem is used by: 8cn 12433 8m1e7 12468 7p2e9 12496 7p3e10 12887 7t2e14 12921 7t4e28 12923 7t7e49 12926 cos2bnd 16349 23prm 17290 83prm 17294 139prm 17295 163prm 17296 317prm 17297 631prm 17298 1259lem1 17302 1259lem2 17303 1259lem3 17304 1259lem4 17305 1259lem5 17306 1259prm 17307 2503lem1 17308 2503lem2 17309 2503lem3 17310 4001lem1 17312 4001lem4 17315 4001prm 17316 log2ublem3 27269 log2ub 27270 bclbnd 27600 bposlem8 27611 2lgslem3d 27719 ex-prmo 31053 hgt750lem 35273 hgt750lem2 35274 60lcm7e420 43040 3exp7 43083 3lexlogpow5ineq1 43084 aks4d1p1 43106 25or6to4 43236 1p8e9 43295 sq7 43333 235t711 43342 ex-decpmul 43343 3cubeslem3r 43677 fmtno5lem4 48610 257prm 48615 fmtno4nprmfac193 48628 fmtno5fac 48636 m3prm 48646 139prmALT 48650 127prm 48653 m7prm 48654 ppivalnn4 48681 2exp340mod341 48800 8exp8mod9 48803 |
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