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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 8934 | . 2 ⊢ 4 ∈ ℝ | |
2 | 1 | recni 7911 | 1 ⊢ 4 ∈ ℂ |
Colors of variables: wff set class |
Syntax hints: ∈ wcel 2136 ℂcc 7751 4c4 8910 |
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 1435 ax-7 1436 ax-gen 1437 ax-ie1 1481 ax-ie2 1482 ax-8 1492 ax-11 1494 ax-4 1498 ax-17 1514 ax-i9 1518 ax-ial 1522 ax-i5r 1523 ax-ext 2147 ax-resscn 7845 ax-1re 7847 ax-addrcl 7850 |
This theorem depends on definitions: df-bi 116 df-nf 1449 df-sb 1751 df-clab 2152 df-cleq 2158 df-clel 2161 df-in 3122 df-ss 3129 df-2 8916 df-3 8917 df-4 8918 |
This theorem is referenced by: 5m1e4 8979 4p2e6 9000 4p3e7 9001 4p4e8 9002 4t2e8 9015 4d2e2 9017 8th4div3 9076 div4p1lem1div2 9110 5p5e10 9392 4t4e16 9420 6t5e30 9428 fzo0to42pr 10155 fldiv4p1lem1div2 10240 sq4e2t8 10552 sqoddm1div8 10608 4bc3eq4 10686 4bc2eq6 10687 resqrexlemover 10952 resqrexlemcalc1 10956 resqrexlemcalc3 10958 cos2bnd 11701 flodddiv4 11871 6gcd4e2 11928 6lcm4e12 12019 pythagtriplem1 12197 dveflem 13327 sincosq4sgn 13390 cosq23lt0 13394 sincos6thpi 13403 ex-exp 13608 ex-fac 13609 ex-bc 13610 |
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