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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 12414 | . 2 ⊢ 7 = (6 + 1) | |
| 2 | 6cn 12438 | . . 3 ⊢ 6 ∈ ℂ | |
| 3 | ax-1cn 11262 | . . 3 ⊢ 1 ∈ ℂ | |
| 4 | 2, 3 | addcli 11319 | . 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 2144 (class class class)co 7421 ℂcc 11202 1c1 11205 + caddc 11207 6c6 12405 7c7 12406 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-ext 2732 ax-1cn 11262 ax-addcl 11264 |
| This proof depends on definitions: df-bi 210 df-an 402 df-ex 1812 df-cleq 2752 df-clel 2835 df-2 12409 df-3 12410 df-4 12411 df-5 12412 df-6 12413 df-7 12414 |
| This theorem is used by: 8cn 12444 8m1e7 12479 7p2e9 12507 7p3e10 12898 7t2e14 12932 7t4e28 12934 7t7e49 12937 cos2bnd 16362 23prm 17303 83prm 17307 139prm 17308 163prm 17309 317prm 17310 631prm 17311 1259lem1 17315 1259lem2 17316 1259lem3 17317 1259lem4 17318 1259lem5 17319 1259prm 17320 2503lem1 17321 2503lem2 17322 2503lem3 17323 4001lem1 17325 4001lem4 17328 4001prm 17329 log2ublem3 27282 log2ub 27283 bclbnd 27613 bposlem8 27624 2lgslem3d 27732 ex-prmo 31066 hgt750lem 35327 hgt750lem2 35328 60lcm7e420 43154 3exp7 43197 3lexlogpow5ineq1 43198 aks4d1p1 43220 25or6to4 43350 1p8e9 43409 sq7 43447 235t711 43456 ex-decpmul 43457 3cubeslem3r 43791 fmtno5lem4 48735 257prm 48740 fmtno4nprmfac193 48753 fmtno5fac 48761 m3prm 48771 139prmALT 48775 127prm 48778 m7prm 48779 ppivalnn4 48806 2exp340mod341 48925 8exp8mod9 48928 |
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