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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 12251 | . 2 ⊢ 9 = (8 + 1) | |
| 2 | 8cn 12278 | . . 3 ⊢ 8 ∈ ℂ | |
| 3 | ax-1cn 11096 | . . 3 ⊢ 1 ∈ ℂ | |
| 4 | 2, 3 | addcli 11151 | . 2 ⊢ (8 + 1) ∈ ℂ |
| 5 | 1, 4 | eqeltri 2832 | 1 ⊢ 9 ∈ ℂ |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2114 (class class class)co 7367 ℂcc 11036 1c1 11039 + caddc 11041 8c8 12242 9c9 12243 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2708 ax-1cn 11096 ax-addcl 11098 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-ex 1782 df-cleq 2728 df-clel 2811 df-2 12244 df-3 12245 df-4 12246 df-5 12247 df-6 12248 df-7 12249 df-8 12250 df-9 12251 |
| This theorem is referenced by: 10m1e9 12740 9t2e18 12766 9t8e72 12772 9t9e81 12773 9t11e99 12774 0.999... 15846 cos2bnd 16155 3dvds 16300 3dvdsdec 16301 3dvds2dec 16302 2exp8 17059 139prm 17094 163prm 17095 317prm 17096 631prm 17097 1259lem1 17101 1259lem2 17102 1259lem3 17103 1259lem4 17104 1259lem5 17105 2503lem1 17107 2503lem2 17108 2503lem3 17109 2503prm 17110 4001lem1 17111 4001lem2 17112 4001lem3 17113 4001lem4 17114 sqrt2cxp2logb9e3 26763 mcubic 26811 cubic2 26812 cubic 26813 quartlem1 26821 log2tlbnd 26909 log2ublem3 26912 log2ub 26913 bposlem8 27254 ex-lcm 30528 9p10ne21 30540 1mhdrd 32975 hgt750lem2 34796 60gcd7e1 42444 3lexlogpow5ineq1 42493 3lexlogpow2ineq2 42498 3lexlogpow5ineq5 42499 sq9 42730 sum9cubes 43105 fmtno5lem4 48019 257prm 48024 fmtno4nprmfac193 48037 139prmALT 48059 127prm 48062 8exp8mod9 48212 nfermltl8rev 48218 evengpop3 48274 |
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