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| Mirrors > Home > MPE Home > Th. List > 9cn | Structured version Visualization version GIF version | ||
| Description: The number 9 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 |
|---|---|
| 9cn | ⊢ 9 ∈ ℂ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-9 12422 | . 2 ⊢ 9 = (8 + 1) | |
| 2 | 8cn 12450 | . . 3 ⊢ 8 ∈ ℂ | |
| 3 | ax-1cn 11268 | . . 3 ⊢ 1 ∈ ℂ | |
| 4 | 2, 3 | addcli 11325 | . 2 ⊢ (8 + 1) ∈ ℂ |
| 5 | 1, 4 | eqeltri 2859 | 1 ⊢ 9 ∈ ℂ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2146 (class class class)co 7427 ℂcc 11208 1c1 11211 + caddc 11213 8c8 12413 9c9 12414 |
| 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 1944 ax-6 2001 ax-7 2042 ax-8 2148 ax-9 2156 ax-ext 2735 ax-1cn 11268 ax-addcl 11270 |
| This proof depends on definitions: df-bi 210 df-an 402 df-ex 1812 df-cleq 2755 df-clel 2838 df-2 12415 df-3 12416 df-4 12417 df-5 12418 df-6 12419 df-7 12420 df-8 12421 df-9 12422 |
| This theorem is used by: 10m1e9 12925 9t2e18 12951 9t8e72 12957 9t9e81 12958 9t11e99OLD 12960 0.999... 16062 cos2bnd 16368 3dvds 16513 3dvdsdec 16514 3dvds2dec 16515 2exp8 17278 139prm 17314 163prm 17315 317prm 17316 631prm 17317 1259lem1 17321 1259lem2 17322 1259lem3 17323 1259lem4 17324 1259lem5 17325 2503lem1 17327 2503lem2 17328 2503lem3 17329 2503prm 17330 4001lem1 17331 4001lem2 17332 4001lem3 17333 4001lem4 17334 sqrt2cxp2logb9e3 27139 mcubic 27187 cubic2 27188 cubic 27189 quartlem1 27197 log2tlbnd 27285 log2ublem3 27288 log2ub 27289 bposlem8 27630 ex-lcm 31071 9p10ne21 31083 1mhdrd 33535 hgt750lem2 35334 60gcd7e1 43195 3lexlogpow5ineq1 43244 3lexlogpow2ineq2 43249 3lexlogpow5ineq5 43250 25or6to4 43396 sq9 43495 sum9cubes 43823 fmtno5lem4 48780 257prm 48785 fmtno4nprmfac193 48798 139prmALT 48820 127prm 48823 8exp8mod9 48973 nfermltl8rev 48979 evengpop3 49035 |
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