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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 8916 | . 2 ⊢ 4 ∈ ℝ | |
2 | 1 | recni 7893 | 1 ⊢ 4 ∈ ℂ |
Colors of variables: wff set class |
Syntax hints: ∈ wcel 2128 ℂcc 7733 4c4 8892 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-5 1427 ax-7 1428 ax-gen 1429 ax-ie1 1473 ax-ie2 1474 ax-8 1484 ax-11 1486 ax-4 1490 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2139 ax-resscn 7827 ax-1re 7829 ax-addrcl 7832 |
This theorem depends on definitions: df-bi 116 df-nf 1441 df-sb 1743 df-clab 2144 df-cleq 2150 df-clel 2153 df-in 3108 df-ss 3115 df-2 8898 df-3 8899 df-4 8900 |
This theorem is referenced by: 5m1e4 8961 4p2e6 8982 4p3e7 8983 4p4e8 8984 4t2e8 8997 4d2e2 8999 8th4div3 9058 div4p1lem1div2 9092 5p5e10 9371 4t4e16 9399 6t5e30 9407 fzo0to42pr 10129 fldiv4p1lem1div2 10214 sq4e2t8 10526 sqoddm1div8 10581 4bc3eq4 10659 4bc2eq6 10660 resqrexlemover 10922 resqrexlemcalc1 10926 resqrexlemcalc3 10928 cos2bnd 11669 flodddiv4 11838 6gcd4e2 11895 6lcm4e12 11980 pythagtriplem1 12156 dveflem 13183 sincosq4sgn 13246 cosq23lt0 13250 sincos6thpi 13259 ex-exp 13400 ex-fac 13401 ex-bc 13402 |
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