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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 12411 | . 2 ⊢ 8 = (7 + 1) | |
| 2 | 7cn 12437 | . . 3 ⊢ 7 ∈ ℂ | |
| 3 | ax-1cn 11258 | . . 3 ⊢ 1 ∈ ℂ | |
| 4 | 2, 3 | addcli 11315 | . 2 ⊢ (7 + 1) ∈ ℂ |
| 5 | 1, 4 | eqeltri 2857 | 1 ⊢ 8 ∈ ℂ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2145 (class class class)co 7420 ℂcc 11198 1c1 11201 + caddc 11203 7c7 12402 8c8 12403 |
| 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 2733 ax-1cn 11258 ax-addcl 11260 |
| This proof depends on definitions: df-bi 210 df-an 402 df-ex 1813 df-cleq 2753 df-clel 2836 df-2 12405 df-3 12406 df-4 12407 df-5 12408 df-6 12409 df-7 12410 df-8 12411 |
| This theorem is used by: 9cn 12443 9m1e8 12476 8th4div3 12566 8p2e10 12899 8t2e16 12934 8t5e40 12937 cos2bnd 16356 2exp11 17267 2exp16 17268 139prm 17302 163prm 17303 317prm 17304 631prm 17305 1259lem2 17310 1259lem3 17311 1259lem4 17312 1259lem5 17313 2503lem2 17316 2503lem3 17317 2503prm 17318 4001lem1 17319 4001lem2 17320 4001prm 17323 quart1cl 27182 quart1lem 27183 quart1 27184 quartlem1 27185 log2tlbnd 27273 log2ublem3 27276 log2ub 27277 bposlem8 27618 lgsdir2lem1 27652 lgsdir2lem5 27656 2lgslem3a 27723 2lgslem3b 27724 2lgslem3c 27725 2lgslem3d 27726 2lgslem3a1 27727 2lgslem3b1 27728 2lgslem3c1 27729 2lgslem3d1 27730 2lgsoddprmlem1 27735 2lgsoddprmlem2 27736 2lgsoddprmlem3a 27737 2lgsoddprmlem3b 27738 2lgsoddprmlem3c 27739 2lgsoddprmlem3d 27740 ex-exp 31051 hgt750lem2 35281 420lcm8e840 43061 3exp7 43103 3lexlogpow5ineq1 43104 3lexlogpow5ineq5 43110 aks4d1p1 43126 sq8 43354 ex-decpmul 43363 resqrtvalex 44644 imsqrtvalex 44645 sin5tlem4 47921 sin5tlem5 47922 fmtno5lem4 48640 257prm 48645 fmtnoprmfac2lem1 48650 fmtno4prmfac 48656 fmtno4nprmfac193 48658 fmtno5faclem3 48665 m3prm 48676 139prmALT 48680 127prm 48683 m7prm 48684 5tcu2e40 48699 2exp340mod341 48830 8exp8mod9 48833 nfermltl8rev 48839 evengpop3 48895 tgoldbachlt 48913 |
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