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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 12332 | . 2 ⊢ 7 = (6 + 1) | |
| 2 | 6cn 12356 | . . 3 ⊢ 6 ∈ ℂ | |
| 3 | ax-1cn 11182 | . . 3 ⊢ 1 ∈ ℂ | |
| 4 | 2, 3 | addcli 11239 | . 2 ⊢ (6 + 1) ∈ ℂ |
| 5 | 1, 4 | eqeltri 2856 | 1 ⊢ 7 ∈ ℂ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2145 (class class class)co 7413 ℂcc 11122 1c1 11125 + caddc 11127 6c6 12323 7c7 12324 |
| 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 2732 ax-1cn 11182 ax-addcl 11184 |
| This proof depends on definitions: df-bi 210 df-an 402 df-ex 1813 df-cleq 2752 df-clel 2835 df-2 12327 df-3 12328 df-4 12329 df-5 12330 df-6 12331 df-7 12332 |
| This theorem is used by: 8cn 12362 8m1e7 12397 7p2e9 12425 7p3e10 12816 7t2e14 12850 7t4e28 12852 7t7e49 12855 cos2bnd 16276 23prm 17211 83prm 17215 139prm 17216 163prm 17217 317prm 17218 631prm 17219 1259lem1 17223 1259lem2 17224 1259lem3 17225 1259lem4 17226 1259lem5 17227 1259prm 17228 2503lem1 17229 2503lem2 17230 2503lem3 17231 4001lem1 17233 4001lem4 17236 4001prm 17237 log2ublem3 27185 log2ub 27186 bclbnd 27516 bposlem8 27527 2lgslem3d 27635 ex-prmo 30939 hgt750lem 35159 hgt750lem2 35160 60lcm7e420 42876 3exp7 42919 3lexlogpow5ineq1 42920 aks4d1p1 42942 25or6to4 43072 1p8e9 43131 sq7 43171 235t711 43180 ex-decpmul 43181 3cubeslem3r 43532 fmtno5lem4 48459 257prm 48464 fmtno4nprmfac193 48477 fmtno5fac 48485 m3prm 48495 139prmALT 48499 127prm 48502 m7prm 48503 ppivalnn4 48530 2exp340mod341 48649 8exp8mod9 48652 |
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