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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 12326 | . 2 ⊢ 8 = (7 + 1) | |
| 2 | 7cn 12352 | . . 3 ⊢ 7 ∈ ℂ | |
| 3 | ax-1cn 11175 | . . 3 ⊢ 1 ∈ ℂ | |
| 4 | 2, 3 | addcli 11232 | . 2 ⊢ (7 + 1) ∈ ℂ |
| 5 | 1, 4 | eqeltri 2861 | 1 ⊢ 8 ∈ ℂ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2146 (class class class)co 7419 ℂcc 11115 1c1 11118 + caddc 11120 7c7 12317 8c8 12318 |
| 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 2148 ax-9 2156 ax-ext 2737 ax-1cn 11175 ax-addcl 11177 |
| This proof depends on definitions: df-bi 210 df-an 402 df-ex 1813 df-cleq 2757 df-clel 2840 df-2 12320 df-3 12321 df-4 12322 df-5 12323 df-6 12324 df-7 12325 df-8 12326 |
| This theorem is used by: 9cn 12358 9m1e8 12391 8th4div3 12481 8p2e10 12814 8t2e16 12849 8t5e40 12852 cos2bnd 16268 2exp11 17173 2exp16 17174 139prm 17208 163prm 17209 317prm 17210 631prm 17211 1259lem2 17216 1259lem3 17217 1259lem4 17218 1259lem5 17219 2503lem2 17222 2503lem3 17223 2503prm 17224 4001lem1 17225 4001lem2 17226 4001prm 17229 quart1cl 27072 quart1lem 27073 quart1 27074 quartlem1 27075 log2tlbnd 27163 log2ublem3 27166 log2ub 27167 bposlem8 27508 lgsdir2lem1 27542 lgsdir2lem5 27546 2lgslem3a 27613 2lgslem3b 27614 2lgslem3c 27615 2lgslem3d 27616 2lgslem3a1 27617 2lgslem3b1 27618 2lgslem3c1 27619 2lgslem3d1 27620 2lgsoddprmlem1 27625 2lgsoddprmlem2 27626 2lgsoddprmlem3a 27627 2lgsoddprmlem3b 27628 2lgsoddprmlem3c 27629 2lgsoddprmlem3d 27630 ex-exp 30874 hgt750lem2 35106 420lcm8e840 42838 3exp7 42880 3lexlogpow5ineq1 42881 3lexlogpow5ineq5 42887 aks4d1p1 42903 sq8 43118 ex-decpmul 43127 resqrtvalex 44431 imsqrtvalex 44432 sin5tlem4 47673 sin5tlem5 47674 fmtno5lem4 48368 257prm 48373 fmtnoprmfac2lem1 48378 fmtno4prmfac 48384 fmtno4nprmfac193 48386 fmtno5faclem3 48393 m3prm 48404 139prmALT 48408 127prm 48411 m7prm 48412 5tcu2e40 48427 2exp340mod341 48558 8exp8mod9 48561 nfermltl8rev 48567 evengpop3 48623 tgoldbachlt 48641 |
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