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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 12212 | . 2 ⊢ 8 = (7 + 1) | |
| 2 | 7cn 12237 | . . 3 ⊢ 7 ∈ ℂ | |
| 3 | ax-1cn 11082 | . . 3 ⊢ 1 ∈ ℂ | |
| 4 | 2, 3 | addcli 11136 | . 2 ⊢ (7 + 1) ∈ ℂ |
| 5 | 1, 4 | eqeltri 2830 | 1 ⊢ 8 ∈ ℂ |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2113 (class class class)co 7356 ℂcc 11022 1c1 11025 + caddc 11027 7c7 12203 8c8 12204 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-ext 2706 ax-1cn 11082 ax-addcl 11084 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-ex 1781 df-cleq 2726 df-clel 2809 df-2 12206 df-3 12207 df-4 12208 df-5 12209 df-6 12210 df-7 12211 df-8 12212 |
| This theorem is referenced by: 9cn 12243 9m1e8 12272 8p2e10 12685 8t2e16 12720 8t5e40 12723 cos2bnd 16111 2exp11 17015 2exp16 17016 139prm 17049 163prm 17050 317prm 17051 631prm 17052 1259lem2 17057 1259lem3 17058 1259lem4 17059 1259lem5 17060 2503lem2 17063 2503lem3 17064 2503prm 17065 4001lem1 17066 4001lem2 17067 4001prm 17070 quart1cl 26818 quart1lem 26819 quart1 26820 quartlem1 26821 log2tlbnd 26909 log2ublem3 26912 log2ub 26913 bposlem8 27256 lgsdir2lem1 27290 lgsdir2lem5 27294 2lgslem3a 27361 2lgslem3b 27362 2lgslem3c 27363 2lgslem3d 27364 2lgslem3a1 27365 2lgslem3b1 27366 2lgslem3c1 27367 2lgslem3d1 27368 2lgsoddprmlem1 27373 2lgsoddprmlem2 27374 2lgsoddprmlem3a 27375 2lgsoddprmlem3b 27376 2lgsoddprmlem3c 27377 2lgsoddprmlem3d 27378 ex-exp 30474 hgt750lem2 34758 420lcm8e840 42204 3exp7 42246 3lexlogpow5ineq1 42247 3lexlogpow5ineq5 42253 aks4d1p1 42269 sq8 42494 ex-decpmul 42503 resqrtvalex 43828 imsqrtvalex 43829 fmtno5lem4 47744 257prm 47749 fmtnoprmfac2lem1 47754 fmtno4prmfac 47760 fmtno4nprmfac193 47762 fmtno5faclem3 47769 m3prm 47780 139prmALT 47784 127prm 47787 m7prm 47788 5tcu2e40 47803 2exp340mod341 47921 8exp8mod9 47924 nfermltl8rev 47930 evengpop3 47986 tgoldbachlt 48004 |
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