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| Mirrors > Home > MPE Home > Th. List > halfcl | Structured version Visualization version GIF version | ||
| Description: Closure of half of a number. (Contributed by NM, 1-Jan-2006.) |
| Ref | Expression |
|---|---|
| halfcl | ⊢ (𝐴 ∈ ℂ → (𝐴 / 2) ∈ ℂ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 2cn 12334 | . 2 ⊢ 2 ∈ ℂ | |
| 2 | 2ne0 12365 | . 2 ⊢ 2 ≠ 0 | |
| 3 | divcl 11896 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 2 ∈ ℂ ∧ 2 ≠ 0) → (𝐴 / 2) ∈ ℂ) | |
| 4 | 1, 2, 3 | mp3an23 1482 | 1 ⊢ (𝐴 ∈ ℂ → (𝐴 / 2) ∈ ℂ) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∈ wcel 2146 ≠ wne 2961 (class class class)co 7423 ℂcc 11116 0cc0 11118 / cdiv 11889 2c2 12313 |
| 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 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2738 ax-sep 5262 ax-nul 5274 ax-pow 5341 ax-pr 5409 ax-un 7745 ax-resscn 11175 ax-1cn 11176 ax-icn 11177 ax-addcl 11178 ax-addrcl 11179 ax-mulcl 11180 ax-mulrcl 11181 ax-mulcom 11182 ax-addass 11183 ax-mulass 11184 ax-distr 11185 ax-i2m1 11186 ax-1ne0 11187 ax-1rid 11188 ax-rnegex 11189 ax-rrecex 11190 ax-cnre 11191 ax-pre-lttri 11192 ax-pre-lttrn 11193 ax-pre-ltadd 11194 ax-pre-mulgt0 11195 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2570 df-eu 2600 df-clab 2745 df-cleq 2758 df-clel 2841 df-nfc 2915 df-ne 2962 df-nel 3068 df-ral 3083 df-rex 3093 df-rmo 3372 df-reu 3373 df-rab 3420 df-v 3460 df-sbc 3748 df-csb 3857 df-dif 3911 df-un 3913 df-in 3915 df-ss 3925 df-pss 3928 df-nul 4290 df-if 4493 df-pw 4569 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4878 df-iun 4963 df-br 5115 df-opab 5179 df-mpt 5198 df-tr 5224 df-id 5561 df-eprel 5566 df-po 5574 df-so 5575 df-fr 5619 df-we 5621 df-xp 5672 df-rel 5673 df-cnv 5674 df-co 5675 df-dm 5676 df-rn 5677 df-res 5678 df-ima 5679 df-pred 6309 df-ord 6370 df-on 6371 df-lim 6372 df-suc 6373 df-iota 6499 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7380 df-ov 7426 df-oprab 7427 df-mpo 7428 df-om 7872 df-2nd 7996 df-frecs 8287 df-wrecs 8318 df-recs 8367 df-rdg 8406 df-er 8703 df-en 8953 df-dom 8954 df-sdom 8955 df-pnf 11263 df-mnf 11264 df-xr 11265 df-ltxr 11266 df-le 11267 df-sub 11461 df-neg 11462 df-div 11890 df-nn 12252 df-2 12321 |
| This theorem is used by: halfaddsubcl 12494 subhalfhalf 12496 halfcld 12507 geo2sum 15953 efhalfpi 26673 cosq14gt0 26712 cosq14ge0 26713 abssinper 26723 coseq1 26727 efeq1 26730 sqrtcn 26952 1cubr 27044 dquartlem1 27053 acosf 27076 atanf 27082 acosneg 27089 acoscos 27095 acos1 27097 sinacos 27107 atanneg 27109 atancj 27112 efiatan 27114 efiatan2 27119 2efiatan 27120 atantan 27125 atanbndlem 27127 dvatan 27137 atantayl 27139 gausslemma2dlem1a 27566 minvecolem2 31264 sin2h 38302 cos2h 38303 dirkercncflem2 46859 fourierdlem58 46919 tannpoly 47668 |
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