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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 12421 | . 2 ⊢ 8 = (7 + 1) | |
| 2 | 7cn 12447 | . . 3 ⊢ 7 ∈ ℂ | |
| 3 | ax-1cn 11268 | . . 3 ⊢ 1 ∈ ℂ | |
| 4 | 2, 3 | addcli 11325 | . 2 ⊢ (7 + 1) ∈ ℂ |
| 5 | 1, 4 | eqeltri 2859 | 1 ⊢ 8 ∈ ℂ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2146 (class class class)co 7427 ℂcc 11208 1c1 11211 + caddc 11213 7c7 12412 8c8 12413 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1944 ax-6 2001 ax-7 2042 ax-8 2148 ax-9 2156 ax-ext 2735 ax-1cn 11268 ax-addcl 11270 |
| This proof depends on definitions: df-bi 210 df-an 402 df-ex 1812 df-cleq 2755 df-clel 2838 df-2 12415 df-3 12416 df-4 12417 df-5 12418 df-6 12419 df-7 12420 df-8 12421 |
| This theorem is used by: 9cn 12453 9m1e8 12486 8th4div3 12576 8p2e10 12909 8t2e16 12944 8t5e40 12947 cos2bnd 16368 2exp11 17279 2exp16 17280 139prm 17314 163prm 17315 317prm 17316 631prm 17317 1259lem2 17322 1259lem3 17323 1259lem4 17324 1259lem5 17325 2503lem2 17328 2503lem3 17329 2503prm 17330 4001lem1 17331 4001lem2 17332 4001prm 17335 quart1cl 27194 quart1lem 27195 quart1 27196 quartlem1 27197 log2tlbnd 27285 log2ublem3 27288 log2ub 27289 bposlem8 27630 lgsdir2lem1 27664 lgsdir2lem5 27668 2lgslem3a 27735 2lgslem3b 27736 2lgslem3c 27737 2lgslem3d 27738 2lgslem3a1 27739 2lgslem3b1 27740 2lgslem3c1 27741 2lgslem3d1 27742 2lgsoddprmlem1 27747 2lgsoddprmlem2 27748 2lgsoddprmlem3a 27749 2lgsoddprmlem3b 27750 2lgsoddprmlem3c 27751 2lgsoddprmlem3d 27752 ex-exp 31063 hgt750lem2 35334 420lcm8e840 43201 3exp7 43243 3lexlogpow5ineq1 43244 3lexlogpow5ineq5 43250 aks4d1p1 43266 sq8 43494 ex-decpmul 43503 resqrtvalex 44785 imsqrtvalex 44786 sin5tlem4 48061 sin5tlem5 48062 fmtno5lem4 48780 257prm 48785 fmtnoprmfac2lem1 48790 fmtno4prmfac 48796 fmtno4nprmfac193 48798 fmtno5faclem3 48805 m3prm 48816 139prmALT 48820 127prm 48823 m7prm 48824 5tcu2e40 48839 2exp340mod341 48970 8exp8mod9 48973 nfermltl8rev 48979 evengpop3 49035 tgoldbachlt 49053 |
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