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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 12411 | . 2 ⊢ 7 = (6 + 1) | |
| 2 | 6cn 12435 | . . 3 ⊢ 6 ∈ ℂ | |
| 3 | ax-1cn 11259 | . . 3 ⊢ 1 ∈ ℂ | |
| 4 | 2, 3 | addcli 11316 | . 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 7421 ℂcc 11199 1c1 11202 + caddc 11204 6c6 12402 7c7 12403 |
| 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 11259 ax-addcl 11261 |
| This proof depends on definitions: df-bi 210 df-an 402 df-ex 1813 df-cleq 2753 df-clel 2836 df-2 12406 df-3 12407 df-4 12408 df-5 12409 df-6 12410 df-7 12411 |
| This theorem is used by: 8cn 12441 8m1e7 12476 7p2e9 12504 7p3e10 12895 7t2e14 12929 7t4e28 12931 7t7e49 12934 cos2bnd 16357 23prm 17298 83prm 17302 139prm 17303 163prm 17304 317prm 17305 631prm 17306 1259lem1 17310 1259lem2 17311 1259lem3 17312 1259lem4 17313 1259lem5 17314 1259prm 17315 2503lem1 17316 2503lem2 17317 2503lem3 17318 4001lem1 17320 4001lem4 17323 4001prm 17324 log2ublem3 27277 log2ub 27278 bclbnd 27608 bposlem8 27619 2lgslem3d 27727 ex-prmo 31061 hgt750lem 35281 hgt750lem2 35282 60lcm7e420 43062 3exp7 43105 3lexlogpow5ineq1 43106 aks4d1p1 43128 25or6to4 43258 1p8e9 43317 sq7 43355 235t711 43364 ex-decpmul 43365 3cubeslem3r 43699 fmtno5lem4 48642 257prm 48647 fmtno4nprmfac193 48660 fmtno5fac 48668 m3prm 48678 139prmALT 48682 127prm 48685 m7prm 48686 ppivalnn4 48713 2exp340mod341 48832 8exp8mod9 48835 |
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