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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 8990 | . 2 ⊢ 4 ∈ ℝ | |
2 | 1 | recni 7964 | 1 ⊢ 4 ∈ ℂ |
Colors of variables: wff set class |
Syntax hints: ∈ wcel 2148 ℂcc 7804 4c4 8966 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-5 1447 ax-7 1448 ax-gen 1449 ax-ie1 1493 ax-ie2 1494 ax-8 1504 ax-11 1506 ax-4 1510 ax-17 1526 ax-i9 1530 ax-ial 1534 ax-i5r 1535 ax-ext 2159 ax-resscn 7898 ax-1re 7900 ax-addrcl 7903 |
This theorem depends on definitions: df-bi 117 df-nf 1461 df-sb 1763 df-clab 2164 df-cleq 2170 df-clel 2173 df-in 3135 df-ss 3142 df-2 8972 df-3 8973 df-4 8974 |
This theorem is referenced by: 5m1e4 9035 4p2e6 9056 4p3e7 9057 4p4e8 9058 4t2e8 9071 4d2e2 9073 8th4div3 9132 div4p1lem1div2 9166 5p5e10 9448 4t4e16 9476 6t5e30 9484 fzo0to42pr 10213 fldiv4p1lem1div2 10298 sq4e2t8 10610 sqoddm1div8 10666 4bc3eq4 10744 4bc2eq6 10745 resqrexlemover 11010 resqrexlemcalc1 11014 resqrexlemcalc3 11016 cos2bnd 11759 flodddiv4 11929 6gcd4e2 11986 6lcm4e12 12077 pythagtriplem1 12255 dveflem 13969 sincosq4sgn 14032 cosq23lt0 14036 sincos6thpi 14045 ex-exp 14250 ex-fac 14251 ex-bc 14252 |
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