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| Mirrors > Home > ILE Home > Th. List > 4cn | GIF version | ||
| Description: The number 4 is a complex number. (Contributed by David A. Wheeler, 7-Jul-2016.) |
| Ref | Expression |
|---|---|
| 4cn | ⊢ 4 ∈ ℂ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 4re 9381 | . 2 ⊢ 4 ∈ ℝ | |
| 2 | 1 | recni 8338 | 1 ⊢ 4 ∈ ℂ |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: ∈ wcel 2209 ℂcc 8177 4c4 9357 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-11 1559 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 ax-resscn 8271 ax-1re 8273 ax-addrcl 8276 |
| This proof depends on definitions: df-bi 117 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-in 3226 df-ss 3233 df-2 9363 df-3 9364 df-4 9365 |
| This theorem is used by: 5m1e4 9426 4p2e6 9448 4p3e7 9449 4p4e8 9450 4t2e8 9463 4d2e2 9465 8th4div3 9524 div4p1lem1div2 9559 5p5e10 9847 4t4e16 9875 6t5e30 9883 fzo0to42pr 10638 fldiv4p1lem1div2 10740 sq4e2t8 11074 sqoddm1div8 11131 4bc3eq4 11212 4bc2eq6 11213 resqrexlemover 11776 resqrexlemcalc1 11780 resqrexlemcalc3 11782 cos2bnd 12527 flodddiv4 12703 6gcd4e2 12772 6lcm4e12 12865 pythagtriplem1 13044 2exp11 13215 dveflem 15827 sincosq4sgn 15930 cosq23lt0 15934 sincos6thpi 15943 log2tlbndlog2 16082 log2ublem3 16085 log2ublog2 16086 2lgslem3a 16212 2lgslem3b 16213 2lgslem3c 16214 2lgslem3d 16215 2lgsoddprmlem2 16225 2lgsoddprmlem3c 16228 2lgsoddprmlem3d 16229 ex-exp 16741 ex-fac 16742 ex-bc 16743 |
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