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| Mirrors > Home > MPE Home > Th. List > 8cn | Structured version Visualization version GIF version | ||
| Description: The number 8 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 |
|---|---|
| 8cn | ⊢ 8 ∈ ℂ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-8 12231 | . 2 ⊢ 8 = (7 + 1) | |
| 2 | 7cn 12256 | . . 3 ⊢ 7 ∈ ℂ | |
| 3 | ax-1cn 11102 | . . 3 ⊢ 1 ∈ ℂ | |
| 4 | 2, 3 | addcli 11156 | . 2 ⊢ (7 + 1) ∈ ℂ |
| 5 | 1, 4 | eqeltri 2824 | 1 ⊢ 8 ∈ ℂ |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2109 (class class class)co 7369 ℂcc 11042 1c1 11045 + caddc 11047 7c7 12222 8c8 12223 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-ext 2701 ax-1cn 11102 ax-addcl 11104 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-ex 1780 df-cleq 2721 df-clel 2803 df-2 12225 df-3 12226 df-4 12227 df-5 12228 df-6 12229 df-7 12230 df-8 12231 |
| This theorem is referenced by: 9cn 12262 9m1e8 12291 8p2e10 12705 8t2e16 12740 8t5e40 12743 cos2bnd 16132 2exp11 17036 2exp16 17037 139prm 17070 163prm 17071 317prm 17072 631prm 17073 1259lem2 17078 1259lem3 17079 1259lem4 17080 1259lem5 17081 2503lem2 17084 2503lem3 17085 2503prm 17086 4001lem1 17087 4001lem2 17088 4001prm 17091 quart1cl 26740 quart1lem 26741 quart1 26742 quartlem1 26743 log2tlbnd 26831 log2ublem3 26834 log2ub 26835 bposlem8 27178 lgsdir2lem1 27212 lgsdir2lem5 27216 2lgslem3a 27283 2lgslem3b 27284 2lgslem3c 27285 2lgslem3d 27286 2lgslem3a1 27287 2lgslem3b1 27288 2lgslem3c1 27289 2lgslem3d1 27290 2lgsoddprmlem1 27295 2lgsoddprmlem2 27296 2lgsoddprmlem3a 27297 2lgsoddprmlem3b 27298 2lgsoddprmlem3c 27299 2lgsoddprmlem3d 27300 ex-exp 30352 hgt750lem2 34616 420lcm8e840 41972 3exp7 42014 3lexlogpow5ineq1 42015 3lexlogpow5ineq5 42021 aks4d1p1 42037 sq8 42258 ex-decpmul 42267 resqrtvalex 43607 imsqrtvalex 43608 fmtno5lem4 47530 257prm 47535 fmtnoprmfac2lem1 47540 fmtno4prmfac 47546 fmtno4nprmfac193 47548 fmtno5faclem3 47555 m3prm 47566 139prmALT 47570 127prm 47573 m7prm 47574 5tcu2e40 47589 2exp340mod341 47707 8exp8mod9 47710 nfermltl8rev 47716 evengpop3 47772 tgoldbachlt 47790 |
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