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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 12246 | . 2 ⊢ 9 = (8 + 1) | |
| 2 | 8cn 12273 | . . 3 ⊢ 8 ∈ ℂ | |
| 3 | ax-1cn 11092 | . . 3 ⊢ 1 ∈ ℂ | |
| 4 | 2, 3 | addcli 11147 | . 2 ⊢ (8 + 1) ∈ ℂ |
| 5 | 1, 4 | eqeltri 2837 | 1 ⊢ 9 ∈ ℂ |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2121 (class class class)co 7359 ℂcc 11032 1c1 11035 + caddc 11037 8c8 12237 9c9 12238 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1975 ax-7 2016 ax-8 2123 ax-9 2131 ax-ext 2713 ax-1cn 11092 ax-addcl 11094 |
| This theorem depends on definitions: df-bi 209 df-an 398 df-ex 1788 df-cleq 2733 df-clel 2816 df-2 12239 df-3 12240 df-4 12241 df-5 12242 df-6 12243 df-7 12244 df-8 12245 df-9 12246 |
| This theorem is referenced by: 10m1e9 12735 9t2e18 12761 9t8e72 12767 9t9e81 12768 9t11e99 12769 0.999... 15841 cos2bnd 16150 3dvds 16295 3dvdsdec 16296 3dvds2dec 16297 2exp8 17054 139prm 17089 163prm 17090 317prm 17091 631prm 17092 1259lem1 17096 1259lem2 17097 1259lem3 17098 1259lem4 17099 1259lem5 17100 2503lem1 17102 2503lem2 17103 2503lem3 17104 2503prm 17105 4001lem1 17106 4001lem2 17107 4001lem3 17108 4001lem4 17109 sqrt2cxp2logb9e3 26784 mcubic 26832 cubic2 26833 cubic 26834 quartlem1 26842 log2tlbnd 26930 log2ublem3 26933 log2ub 26934 bposlem8 27275 ex-lcm 30548 9p10ne21 30560 1mhdrd 32996 hgt750lem2 34846 60gcd7e1 42503 3lexlogpow5ineq1 42552 3lexlogpow2ineq2 42557 3lexlogpow5ineq5 42558 sq9 42788 sum9cubes 43135 fmtno5lem4 48046 257prm 48051 fmtno4nprmfac193 48064 139prmALT 48086 127prm 48089 8exp8mod9 48239 nfermltl8rev 48245 evengpop3 48301 |
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