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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 12245 | . 2 ⊢ 9 = (8 + 1) | |
| 2 | 8cn 12272 | . . 3 ⊢ 8 ∈ ℂ | |
| 3 | ax-1cn 11090 | . . 3 ⊢ 1 ∈ ℂ | |
| 4 | 2, 3 | addcli 11145 | . 2 ⊢ (8 + 1) ∈ ℂ |
| 5 | 1, 4 | eqeltri 2833 | 1 ⊢ 9 ∈ ℂ |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2114 (class class class)co 7361 ℂcc 11030 1c1 11033 + caddc 11035 8c8 12236 9c9 12237 |
| 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 2709 ax-1cn 11090 ax-addcl 11092 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-ex 1782 df-cleq 2729 df-clel 2812 df-2 12238 df-3 12239 df-4 12240 df-5 12241 df-6 12242 df-7 12243 df-8 12244 df-9 12245 |
| This theorem is referenced by: 10m1e9 12734 9t2e18 12760 9t8e72 12766 9t9e81 12767 9t11e99 12768 0.999... 15840 cos2bnd 16149 3dvds 16294 3dvdsdec 16295 3dvds2dec 16296 2exp8 17053 139prm 17088 163prm 17089 317prm 17090 631prm 17091 1259lem1 17095 1259lem2 17096 1259lem3 17097 1259lem4 17098 1259lem5 17099 2503lem1 17101 2503lem2 17102 2503lem3 17103 2503prm 17104 4001lem1 17105 4001lem2 17106 4001lem3 17107 4001lem4 17108 sqrt2cxp2logb9e3 26779 mcubic 26827 cubic2 26828 cubic 26829 quartlem1 26837 log2tlbnd 26925 log2ublem3 26928 log2ub 26929 bposlem8 27271 ex-lcm 30546 9p10ne21 30558 1mhdrd 32993 hgt750lem2 34815 60gcd7e1 42461 3lexlogpow5ineq1 42510 3lexlogpow2ineq2 42515 3lexlogpow5ineq5 42516 sq9 42747 sum9cubes 43122 fmtno5lem4 48034 257prm 48039 fmtno4nprmfac193 48052 139prmALT 48074 127prm 48077 8exp8mod9 48227 nfermltl8rev 48233 evengpop3 48289 |
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