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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 12213 | . 2 ⊢ 9 = (8 + 1) | |
| 2 | 8cn 12240 | . . 3 ⊢ 8 ∈ ℂ | |
| 3 | ax-1cn 11082 | . . 3 ⊢ 1 ∈ ℂ | |
| 4 | 2, 3 | addcli 11136 | . 2 ⊢ (8 + 1) ∈ ℂ |
| 5 | 1, 4 | eqeltri 2830 | 1 ⊢ 9 ∈ ℂ |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2113 (class class class)co 7356 ℂcc 11022 1c1 11025 + caddc 11027 8c8 12204 9c9 12205 |
| 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 2706 ax-1cn 11082 ax-addcl 11084 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-ex 1781 df-cleq 2726 df-clel 2809 df-2 12206 df-3 12207 df-4 12208 df-5 12209 df-6 12210 df-7 12211 df-8 12212 df-9 12213 |
| This theorem is referenced by: 10m1e9 12701 9t2e18 12727 9t8e72 12733 9t9e81 12734 9t11e99 12735 0.999... 15802 cos2bnd 16111 3dvds 16256 3dvdsdec 16257 3dvds2dec 16258 2exp8 17014 139prm 17049 163prm 17050 317prm 17051 631prm 17052 1259lem1 17056 1259lem2 17057 1259lem3 17058 1259lem4 17059 1259lem5 17060 2503lem1 17062 2503lem2 17063 2503lem3 17064 2503prm 17065 4001lem1 17066 4001lem2 17067 4001lem3 17068 4001lem4 17069 sqrt2cxp2logb9e3 26763 mcubic 26811 cubic2 26812 cubic 26813 quartlem1 26821 log2tlbnd 26909 log2ublem3 26912 log2ub 26913 bposlem8 27256 ex-lcm 30482 9p10ne21 30494 1mhdrd 32946 hgt750lem2 34758 60gcd7e1 42198 3lexlogpow5ineq1 42247 3lexlogpow2ineq2 42252 3lexlogpow5ineq5 42253 sq9 42495 sum9cubes 42857 fmtno5lem4 47744 257prm 47749 fmtno4nprmfac193 47762 139prmALT 47784 127prm 47787 8exp8mod9 47924 nfermltl8rev 47930 evengpop3 47986 |
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