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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 12334 | . 2 ⊢ 9 = (8 + 1) | |
2 | 8cn 12361 | . . 3 ⊢ 8 ∈ ℂ | |
3 | ax-1cn 11211 | . . 3 ⊢ 1 ∈ ℂ | |
4 | 2, 3 | addcli 11265 | . 2 ⊢ (8 + 1) ∈ ℂ |
5 | 1, 4 | eqeltri 2835 | 1 ⊢ 9 ∈ ℂ |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2106 (class class class)co 7431 ℂcc 11151 1c1 11154 + caddc 11156 8c8 12325 9c9 12326 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-ext 2706 ax-1cn 11211 ax-addcl 11213 |
This theorem depends on definitions: df-bi 207 df-an 396 df-ex 1777 df-cleq 2727 df-clel 2814 df-2 12327 df-3 12328 df-4 12329 df-5 12330 df-6 12331 df-7 12332 df-8 12333 df-9 12334 |
This theorem is referenced by: 10m1e9 12827 9t2e18 12853 9t8e72 12859 9t9e81 12860 9t11e99 12861 0.999... 15914 cos2bnd 16221 3dvds 16365 3dvdsdec 16366 3dvds2dec 16367 2exp8 17123 139prm 17158 163prm 17159 317prm 17160 631prm 17161 1259lem1 17165 1259lem2 17166 1259lem3 17167 1259lem4 17168 1259lem5 17169 2503lem1 17171 2503lem2 17172 2503lem3 17173 2503prm 17174 4001lem1 17175 4001lem2 17176 4001lem3 17177 4001lem4 17178 sqrt2cxp2logb9e3 26857 mcubic 26905 cubic2 26906 cubic 26907 quartlem1 26915 log2tlbnd 27003 log2ublem3 27006 log2ub 27007 bposlem8 27350 ex-lcm 30487 9p10ne21 30499 1mhdrd 32883 hgt750lem2 34646 60gcd7e1 41987 3lexlogpow5ineq1 42036 3lexlogpow2ineq2 42041 3lexlogpow5ineq5 42042 sq9 42311 sum9cubes 42659 fmtno5lem4 47481 257prm 47486 fmtno4nprmfac193 47499 139prmALT 47521 127prm 47524 8exp8mod9 47661 nfermltl8rev 47667 evengpop3 47723 |
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