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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 12363 | . 2 ⊢ 9 = (8 + 1) | |
2 | 8cn 12390 | . . 3 ⊢ 8 ∈ ℂ | |
3 | ax-1cn 11242 | . . 3 ⊢ 1 ∈ ℂ | |
4 | 2, 3 | addcli 11296 | . 2 ⊢ (8 + 1) ∈ ℂ |
5 | 1, 4 | eqeltri 2840 | 1 ⊢ 9 ∈ ℂ |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2108 (class class class)co 7448 ℂcc 11182 1c1 11185 + caddc 11187 8c8 12354 9c9 12355 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1793 ax-4 1807 ax-5 1909 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-ext 2711 ax-1cn 11242 ax-addcl 11244 |
This theorem depends on definitions: df-bi 207 df-an 396 df-ex 1778 df-cleq 2732 df-clel 2819 df-2 12356 df-3 12357 df-4 12358 df-5 12359 df-6 12360 df-7 12361 df-8 12362 df-9 12363 |
This theorem is referenced by: 10m1e9 12854 9t2e18 12880 9t8e72 12886 9t9e81 12887 9t11e99 12888 0.999... 15929 cos2bnd 16236 3dvds 16379 3dvdsdec 16380 3dvds2dec 16381 2exp8 17136 139prm 17171 163prm 17172 317prm 17173 631prm 17174 1259lem1 17178 1259lem2 17179 1259lem3 17180 1259lem4 17181 1259lem5 17182 2503lem1 17184 2503lem2 17185 2503lem3 17186 2503prm 17187 4001lem1 17188 4001lem2 17189 4001lem3 17190 4001lem4 17191 sqrt2cxp2logb9e3 26860 mcubic 26908 cubic2 26909 cubic 26910 quartlem1 26918 log2tlbnd 27006 log2ublem3 27009 log2ub 27010 bposlem8 27353 ex-lcm 30490 9p10ne21 30502 1mhdrd 32880 hgt750lem2 34629 60gcd7e1 41962 3lexlogpow5ineq1 42011 3lexlogpow2ineq2 42016 3lexlogpow5ineq5 42017 sq9 42286 sum9cubes 42627 fmtno5lem4 47430 257prm 47435 fmtno4nprmfac193 47448 139prmALT 47470 127prm 47473 8exp8mod9 47610 nfermltl8rev 47616 evengpop3 47672 |
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