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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 12287 | . 2 ⊢ 9 = (8 + 1) | |
| 2 | 8cn 12315 | . . 3 ⊢ 8 ∈ ℂ | |
| 3 | ax-1cn 11131 | . . 3 ⊢ 1 ∈ ℂ | |
| 4 | 2, 3 | addcli 11188 | . 2 ⊢ (8 + 1) ∈ ℂ |
| 5 | 1, 4 | eqeltri 2858 | 1 ⊢ 9 ∈ ℂ |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2142 (class class class)co 7396 ℂcc 11071 1c1 11074 + caddc 11076 8c8 12278 9c9 12279 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1815 ax-4 1829 ax-5 1930 ax-6 1987 ax-7 2028 ax-8 2144 ax-9 2152 ax-ext 2734 ax-1cn 11131 ax-addcl 11133 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-ex 1800 df-cleq 2754 df-clel 2837 df-2 12280 df-3 12281 df-4 12282 df-5 12283 df-6 12284 df-7 12285 df-8 12286 df-9 12287 |
| This theorem is referenced by: 10m1e9 12789 9t2e18 12815 9t8e72 12821 9t9e81 12822 9t11e99OLD 12824 0.999... 15911 cos2bnd 16220 3dvds 16365 3dvdsdec 16366 3dvds2dec 16367 2exp8 17124 139prm 17160 163prm 17161 317prm 17162 631prm 17163 1259lem1 17167 1259lem2 17168 1259lem3 17169 1259lem4 17170 1259lem5 17171 2503lem1 17173 2503lem2 17174 2503lem3 17175 2503prm 17176 4001lem1 17177 4001lem2 17178 4001lem3 17179 4001lem4 17180 sqrt2cxp2logb9e3 26864 mcubic 26912 cubic2 26913 cubic 26914 quartlem1 26922 log2tlbnd 27010 log2ublem3 27013 log2ub 27014 bposlem8 27355 ex-lcm 30660 9p10ne21 30672 1mhdrd 33093 hgt750lem2 34946 60gcd7e1 42622 3lexlogpow5ineq1 42671 3lexlogpow2ineq2 42676 3lexlogpow5ineq5 42677 sq9 42907 sum9cubes 43254 fmtno5lem4 48165 257prm 48170 fmtno4nprmfac193 48183 139prmALT 48205 127prm 48208 8exp8mod9 48358 nfermltl8rev 48364 evengpop3 48420 |
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