| Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
| 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 12310 | . 2 ⊢ 9 = (8 + 1) | |
| 2 | 8cn 12338 | . . 3 ⊢ 8 ∈ ℂ | |
| 3 | ax-1cn 11158 | . . 3 ⊢ 1 ∈ ℂ | |
| 4 | 2, 3 | addcli 11215 | . 2 ⊢ (8 + 1) ∈ ℂ |
| 5 | 1, 4 | eqeltri 2865 | 1 ⊢ 9 ∈ ℂ |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2149 (class class class)co 7411 ℂcc 11098 1c1 11101 + caddc 11103 8c8 12301 9c9 12302 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-ext 2741 ax-1cn 11158 ax-addcl 11160 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-ex 1807 df-cleq 2761 df-clel 2844 df-2 12303 df-3 12304 df-4 12305 df-5 12306 df-6 12307 df-7 12308 df-8 12309 df-9 12310 |
| This theorem is referenced by: 10m1e9 12812 9t2e18 12838 9t8e72 12844 9t9e81 12845 9t11e99OLD 12847 0.999... 15935 cos2bnd 16244 3dvds 16389 3dvdsdec 16390 3dvds2dec 16391 2exp8 17148 139prm 17184 163prm 17185 317prm 17186 631prm 17187 1259lem1 17191 1259lem2 17192 1259lem3 17193 1259lem4 17194 1259lem5 17195 2503lem1 17197 2503lem2 17198 2503lem3 17199 2503prm 17200 4001lem1 17201 4001lem2 17202 4001lem3 17203 4001lem4 17204 sqrt2cxp2logb9e3 26930 mcubic 26978 cubic2 26979 cubic 26980 quartlem1 26988 log2tlbnd 27076 log2ublem3 27079 log2ub 27080 bposlem8 27421 ex-lcm 30750 9p10ne21 30762 1mhdrd 33176 hgt750lem2 34984 60gcd7e1 42662 3lexlogpow5ineq1 42711 3lexlogpow2ineq2 42716 3lexlogpow5ineq5 42717 25or6to4 42863 sq9 42949 sum9cubes 43296 fmtno5lem4 48197 257prm 48202 fmtno4nprmfac193 48215 139prmALT 48237 127prm 48240 8exp8mod9 48390 nfermltl8rev 48396 evengpop3 48452 |
| Copyright terms: Public domain | W3C validator |