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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 12451 | . 2 ⊢ 8 = (7 + 1) | |
| 2 | 7cn 12477 | . . 3 ⊢ 7 ∈ ℂ | |
| 3 | ax-1cn 11297 | . . 3 ⊢ 1 ∈ ℂ | |
| 4 | 2, 3 | addcli 11354 | . 2 ⊢ (7 + 1) ∈ ℂ |
| 5 | 1, 4 | eqeltri 2860 | 1 ⊢ 8 ∈ ℂ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2147 (class class class)co 7451 ℂcc 11237 1c1 11240 + caddc 11242 7c7 12442 8c8 12443 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-ext 2735 ax-1cn 11297 ax-addcl 11299 |
| This proof depends on definitions: df-bi 210 df-an 402 df-ex 1813 df-cleq 2755 df-clel 2839 df-2 12445 df-3 12446 df-4 12447 df-5 12448 df-6 12449 df-7 12450 df-8 12451 |
| This theorem is used by: 9cn 12483 9m1e8 12516 8th4div3 12606 8p2e10 12939 8t2e16 12974 8t5e40 12977 cos2bnd 16400 2exp11 17311 2exp16 17312 139prm 17346 163prm 17347 317prm 17348 631prm 17349 1259lem2 17354 1259lem3 17355 1259lem4 17356 1259lem5 17357 2503lem2 17360 2503lem3 17361 2503prm 17362 4001lem1 17363 4001lem2 17364 4001prm 17367 quart1cl 27239 quart1lem 27240 quart1 27241 quartlem1 27242 log2tlbnd 27330 log2ublem3 27333 log2ub 27334 bposlem8 27675 lgsdir2lem1 27709 lgsdir2lem5 27713 2lgslem3a 27780 2lgslem3b 27781 2lgslem3c 27782 2lgslem3d 27783 2lgslem3a1 27784 2lgslem3b1 27785 2lgslem3c1 27786 2lgslem3d1 27787 2lgsoddprmlem1 27792 2lgsoddprmlem2 27793 2lgsoddprmlem3a 27794 2lgsoddprmlem3b 27795 2lgsoddprmlem3c 27796 2lgsoddprmlem3d 27797 ex-exp 31108 hgt750lem2 35392 420lcm8e840 43327 3exp7 43369 3lexlogpow5ineq1 43370 3lexlogpow5ineq5 43376 aks4d1p1 43392 sq8 43620 ex-decpmul 43629 resqrtvalex 44906 imsqrtvalex 44907 sin5tlem4 48195 sin5tlem5 48196 fmtno5lem4 48914 257prm 48919 fmtnoprmfac2lem1 48924 fmtno4prmfac 48930 fmtno4nprmfac193 48932 fmtno5faclem3 48939 m3prm 48950 139prmALT 48954 127prm 48957 m7prm 48958 5tcu2e40 48973 2exp340mod341 49104 8exp8mod9 49107 nfermltl8rev 49113 evengpop3 49169 tgoldbachlt 49187 |
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