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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 12186 | . 2 ⊢ 9 = (8 + 1) | |
| 2 | 8cn 12213 | . . 3 ⊢ 8 ∈ ℂ | |
| 3 | ax-1cn 11055 | . . 3 ⊢ 1 ∈ ℂ | |
| 4 | 2, 3 | addcli 11109 | . 2 ⊢ (8 + 1) ∈ ℂ |
| 5 | 1, 4 | eqeltri 2824 | 1 ⊢ 9 ∈ ℂ |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2109 (class class class)co 7340 ℂcc 10995 1c1 10998 + caddc 11000 8c8 12177 9c9 12178 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-ext 2701 ax-1cn 11055 ax-addcl 11057 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-ex 1780 df-cleq 2721 df-clel 2803 df-2 12179 df-3 12180 df-4 12181 df-5 12182 df-6 12183 df-7 12184 df-8 12185 df-9 12186 |
| This theorem is referenced by: 10m1e9 12675 9t2e18 12701 9t8e72 12707 9t9e81 12708 9t11e99 12709 0.999... 15775 cos2bnd 16084 3dvds 16229 3dvdsdec 16230 3dvds2dec 16231 2exp8 16987 139prm 17022 163prm 17023 317prm 17024 631prm 17025 1259lem1 17029 1259lem2 17030 1259lem3 17031 1259lem4 17032 1259lem5 17033 2503lem1 17035 2503lem2 17036 2503lem3 17037 2503prm 17038 4001lem1 17039 4001lem2 17040 4001lem3 17041 4001lem4 17042 sqrt2cxp2logb9e3 26690 mcubic 26738 cubic2 26739 cubic 26740 quartlem1 26748 log2tlbnd 26836 log2ublem3 26839 log2ub 26840 bposlem8 27183 ex-lcm 30389 9p10ne21 30401 1mhdrd 32851 hgt750lem2 34633 60gcd7e1 41995 3lexlogpow5ineq1 42044 3lexlogpow2ineq2 42049 3lexlogpow5ineq5 42050 sq9 42288 sum9cubes 42662 fmtno5lem4 47554 257prm 47559 fmtno4nprmfac193 47572 139prmALT 47594 127prm 47597 8exp8mod9 47734 nfermltl8rev 47740 evengpop3 47796 |
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