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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 12215 | . 2 ⊢ 9 = (8 + 1) | |
| 2 | 8cn 12242 | . . 3 ⊢ 8 ∈ ℂ | |
| 3 | ax-1cn 11084 | . . 3 ⊢ 1 ∈ ℂ | |
| 4 | 2, 3 | addcli 11138 | . 2 ⊢ (8 + 1) ∈ ℂ |
| 5 | 1, 4 | eqeltri 2832 | 1 ⊢ 9 ∈ ℂ |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2113 (class class class)co 7358 ℂcc 11024 1c1 11027 + caddc 11029 8c8 12206 9c9 12207 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-ext 2708 ax-1cn 11084 ax-addcl 11086 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-ex 1781 df-cleq 2728 df-clel 2811 df-2 12208 df-3 12209 df-4 12210 df-5 12211 df-6 12212 df-7 12213 df-8 12214 df-9 12215 |
| This theorem is referenced by: 10m1e9 12703 9t2e18 12729 9t8e72 12735 9t9e81 12736 9t11e99 12737 0.999... 15804 cos2bnd 16113 3dvds 16258 3dvdsdec 16259 3dvds2dec 16260 2exp8 17016 139prm 17051 163prm 17052 317prm 17053 631prm 17054 1259lem1 17058 1259lem2 17059 1259lem3 17060 1259lem4 17061 1259lem5 17062 2503lem1 17064 2503lem2 17065 2503lem3 17066 2503prm 17067 4001lem1 17068 4001lem2 17069 4001lem3 17070 4001lem4 17071 sqrt2cxp2logb9e3 26765 mcubic 26813 cubic2 26814 cubic 26815 quartlem1 26823 log2tlbnd 26911 log2ublem3 26914 log2ub 26915 bposlem8 27258 ex-lcm 30533 9p10ne21 30545 1mhdrd 32997 hgt750lem2 34809 60gcd7e1 42269 3lexlogpow5ineq1 42318 3lexlogpow2ineq2 42323 3lexlogpow5ineq5 42324 sq9 42563 sum9cubes 42925 fmtno5lem4 47812 257prm 47817 fmtno4nprmfac193 47830 139prmALT 47852 127prm 47855 8exp8mod9 47992 nfermltl8rev 47998 evengpop3 48054 |
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