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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 12242 | . 2 ⊢ 9 = (8 + 1) | |
| 2 | 8cn 12269 | . . 3 ⊢ 8 ∈ ℂ | |
| 3 | ax-1cn 11087 | . . 3 ⊢ 1 ∈ ℂ | |
| 4 | 2, 3 | addcli 11142 | . 2 ⊢ (8 + 1) ∈ ℂ |
| 5 | 1, 4 | eqeltri 2835 | 1 ⊢ 9 ∈ ℂ |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2119 (class class class)co 7356 ℂcc 11027 1c1 11030 + caddc 11032 8c8 12233 9c9 12234 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-ext 2711 ax-1cn 11087 ax-addcl 11089 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-ex 1787 df-cleq 2731 df-clel 2814 df-2 12235 df-3 12236 df-4 12237 df-5 12238 df-6 12239 df-7 12240 df-8 12241 df-9 12242 |
| This theorem is referenced by: 10m1e9 12731 9t2e18 12757 9t8e72 12763 9t9e81 12764 9t11e99 12765 0.999... 15837 cos2bnd 16146 3dvds 16291 3dvdsdec 16292 3dvds2dec 16293 2exp8 17050 139prm 17085 163prm 17086 317prm 17087 631prm 17088 1259lem1 17092 1259lem2 17093 1259lem3 17094 1259lem4 17095 1259lem5 17096 2503lem1 17098 2503lem2 17099 2503lem3 17100 2503prm 17101 4001lem1 17102 4001lem2 17103 4001lem3 17104 4001lem4 17105 sqrt2cxp2logb9e3 26781 mcubic 26829 cubic2 26830 cubic 26831 quartlem1 26839 log2tlbnd 26927 log2ublem3 26930 log2ub 26931 bposlem8 27272 ex-lcm 30546 9p10ne21 30558 1mhdrd 32994 hgt750lem2 34836 60gcd7e1 42490 3lexlogpow5ineq1 42539 3lexlogpow2ineq2 42544 3lexlogpow5ineq5 42545 sq9 42775 sum9cubes 43122 fmtno5lem4 48034 257prm 48039 fmtno4nprmfac193 48052 139prmALT 48074 127prm 48077 8exp8mod9 48227 nfermltl8rev 48233 evengpop3 48289 |
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