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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 12227 | . 2 ⊢ 9 = (8 + 1) | |
| 2 | 8cn 12254 | . . 3 ⊢ 8 ∈ ℂ | |
| 3 | ax-1cn 11096 | . . 3 ⊢ 1 ∈ ℂ | |
| 4 | 2, 3 | addcli 11150 | . 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 7368 ℂcc 11036 1c1 11039 + caddc 11041 8c8 12218 9c9 12219 |
| 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 11096 ax-addcl 11098 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-ex 1782 df-cleq 2729 df-clel 2812 df-2 12220 df-3 12221 df-4 12222 df-5 12223 df-6 12224 df-7 12225 df-8 12226 df-9 12227 |
| This theorem is referenced by: 10m1e9 12715 9t2e18 12741 9t8e72 12747 9t9e81 12748 9t11e99 12749 0.999... 15816 cos2bnd 16125 3dvds 16270 3dvdsdec 16271 3dvds2dec 16272 2exp8 17028 139prm 17063 163prm 17064 317prm 17065 631prm 17066 1259lem1 17070 1259lem2 17071 1259lem3 17072 1259lem4 17073 1259lem5 17074 2503lem1 17076 2503lem2 17077 2503lem3 17078 2503prm 17079 4001lem1 17080 4001lem2 17081 4001lem3 17082 4001lem4 17083 sqrt2cxp2logb9e3 26780 mcubic 26828 cubic2 26829 cubic 26830 quartlem1 26838 log2tlbnd 26926 log2ublem3 26929 log2ub 26930 bposlem8 27273 ex-lcm 30549 9p10ne21 30561 1mhdrd 33012 hgt750lem2 34834 60gcd7e1 42379 3lexlogpow5ineq1 42428 3lexlogpow2ineq2 42433 3lexlogpow5ineq5 42434 sq9 42672 sum9cubes 43034 fmtno5lem4 47920 257prm 47925 fmtno4nprmfac193 47938 139prmALT 47960 127prm 47963 8exp8mod9 48100 nfermltl8rev 48106 evengpop3 48162 |
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