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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 12336 | . 2 ⊢ 8 = (7 + 1) | |
| 2 | 7cn 12362 | . . 3 ⊢ 7 ∈ ℂ | |
| 3 | ax-1cn 11185 | . . 3 ⊢ 1 ∈ ℂ | |
| 4 | 2, 3 | addcli 11242 | . 2 ⊢ (7 + 1) ∈ ℂ |
| 5 | 1, 4 | eqeltri 2856 | 1 ⊢ 8 ∈ ℂ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2145 (class class class)co 7414 ℂcc 11125 1c1 11128 + caddc 11130 7c7 12327 8c8 12328 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2732 ax-1cn 11185 ax-addcl 11187 |
| This proof depends on definitions: df-bi 210 df-an 402 df-ex 1813 df-cleq 2752 df-clel 2835 df-2 12330 df-3 12331 df-4 12332 df-5 12333 df-6 12334 df-7 12335 df-8 12336 |
| This theorem is used by: 9cn 12368 9m1e8 12401 8th4div3 12491 8p2e10 12824 8t2e16 12859 8t5e40 12862 cos2bnd 16279 2exp11 17184 2exp16 17185 139prm 17219 163prm 17220 317prm 17221 631prm 17222 1259lem2 17227 1259lem3 17228 1259lem4 17229 1259lem5 17230 2503lem2 17233 2503lem3 17234 2503prm 17235 4001lem1 17236 4001lem2 17237 4001prm 17240 quart1cl 27094 quart1lem 27095 quart1 27096 quartlem1 27097 log2tlbnd 27185 log2ublem3 27188 log2ub 27189 bposlem8 27530 lgsdir2lem1 27564 lgsdir2lem5 27568 2lgslem3a 27635 2lgslem3b 27636 2lgslem3c 27637 2lgslem3d 27638 2lgslem3a1 27639 2lgslem3b1 27640 2lgslem3c1 27641 2lgslem3d1 27642 2lgsoddprmlem1 27647 2lgsoddprmlem2 27648 2lgsoddprmlem3a 27649 2lgsoddprmlem3b 27650 2lgsoddprmlem3c 27651 2lgsoddprmlem3d 27652 ex-exp 30933 hgt750lem2 35163 420lcm8e840 42880 3exp7 42922 3lexlogpow5ineq1 42923 3lexlogpow5ineq5 42929 aks4d1p1 42945 sq8 43175 ex-decpmul 43184 resqrtvalex 44488 imsqrtvalex 44489 sin5tlem4 47743 sin5tlem5 47744 fmtno5lem4 48462 257prm 48467 fmtnoprmfac2lem1 48472 fmtno4prmfac 48478 fmtno4nprmfac193 48480 fmtno5faclem3 48487 m3prm 48498 139prmALT 48502 127prm 48505 m7prm 48506 5tcu2e40 48521 2exp340mod341 48652 8exp8mod9 48655 nfermltl8rev 48661 evengpop3 48717 tgoldbachlt 48735 |
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