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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 12282 | . 2 ⊢ 9 = (8 + 1) | |
2 | 8cn 12309 | . . 3 ⊢ 8 ∈ ℂ | |
3 | ax-1cn 11168 | . . 3 ⊢ 1 ∈ ℂ | |
4 | 2, 3 | addcli 11220 | . 2 ⊢ (8 + 1) ∈ ℂ |
5 | 1, 4 | eqeltri 2830 | 1 ⊢ 9 ∈ ℂ |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2107 (class class class)co 7409 ℂcc 11108 1c1 11111 + caddc 11113 8c8 12273 9c9 12274 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-ext 2704 ax-1cn 11168 ax-addcl 11170 |
This theorem depends on definitions: df-bi 206 df-an 398 df-ex 1783 df-cleq 2725 df-clel 2811 df-2 12275 df-3 12276 df-4 12277 df-5 12278 df-6 12279 df-7 12280 df-8 12281 df-9 12282 |
This theorem is referenced by: 10m1e9 12773 9t2e18 12799 9t8e72 12805 9t9e81 12806 9t11e99 12807 0.999... 15827 cos2bnd 16131 3dvds 16274 3dvdsdec 16275 3dvds2dec 16276 2exp8 17022 139prm 17057 163prm 17058 317prm 17059 631prm 17060 1259lem1 17064 1259lem2 17065 1259lem3 17066 1259lem4 17067 1259lem5 17068 2503lem1 17070 2503lem2 17071 2503lem3 17072 2503prm 17073 4001lem1 17074 4001lem2 17075 4001lem3 17076 4001lem4 17077 sqrt2cxp2logb9e3 26304 mcubic 26352 cubic2 26353 cubic 26354 quartlem1 26362 log2tlbnd 26450 log2ublem3 26453 log2ub 26454 bposlem8 26794 ex-lcm 29711 9p10ne21 29723 1mhdrd 32082 hgt750lem2 33664 60gcd7e1 40870 3lexlogpow5ineq1 40919 3lexlogpow2ineq2 40924 3lexlogpow5ineq5 40925 sq9 41204 sum9cubes 41414 fmtno5lem4 46224 257prm 46229 fmtno4nprmfac193 46242 139prmALT 46264 127prm 46267 8exp8mod9 46404 nfermltl8rev 46410 evengpop3 46466 |
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