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| Mirrors > Home > MPE Home > Th. List > rehalfcl | Structured version Visualization version GIF version | ||
| Description: Real closure of half. (Contributed by NM, 1-Jan-2006.) |
| Ref | Expression |
|---|---|
| rehalfcl | ⊢ (𝐴 ∈ ℝ → (𝐴 / 2) ∈ ℝ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 2re 12255 | . 2 ⊢ 2 ∈ ℝ | |
| 2 | 2ne0 12285 | . 2 ⊢ 2 ≠ 0 | |
| 3 | redivcl 11874 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 2 ∈ ℝ ∧ 2 ≠ 0) → (𝐴 / 2) ∈ ℝ) | |
| 4 | 1, 2, 3 | mp3an23 1456 | 1 ⊢ (𝐴 ∈ ℝ → (𝐴 / 2) ∈ ℝ) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2114 ≠ wne 2932 (class class class)co 7367 ℝcr 11037 0cc0 11038 / cdiv 11807 2c2 12236 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2708 ax-sep 5231 ax-nul 5241 ax-pow 5307 ax-pr 5375 ax-un 7689 ax-resscn 11095 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-mulrcl 11101 ax-mulcom 11102 ax-addass 11103 ax-mulass 11104 ax-distr 11105 ax-i2m1 11106 ax-1ne0 11107 ax-1rid 11108 ax-rnegex 11109 ax-rrecex 11110 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 ax-pre-ltadd 11114 ax-pre-mulgt0 11115 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3062 df-rmo 3342 df-reu 3343 df-rab 3390 df-v 3431 df-sbc 3729 df-csb 3838 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-pss 3909 df-nul 4274 df-if 4467 df-pw 4543 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4851 df-iun 4935 df-br 5086 df-opab 5148 df-mpt 5167 df-tr 5193 df-id 5526 df-eprel 5531 df-po 5539 df-so 5540 df-fr 5584 df-we 5586 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-pred 6265 df-ord 6326 df-on 6327 df-lim 6328 df-suc 6329 df-iota 6454 df-fun 6500 df-fn 6501 df-f 6502 df-f1 6503 df-fo 6504 df-f1o 6505 df-fv 6506 df-riota 7324 df-ov 7370 df-oprab 7371 df-mpo 7372 df-om 7818 df-2nd 7943 df-frecs 8231 df-wrecs 8262 df-recs 8311 df-rdg 8349 df-er 8643 df-en 8894 df-dom 8895 df-sdom 8896 df-pnf 11181 df-mnf 11182 df-xr 11183 df-ltxr 11184 df-le 11185 df-sub 11379 df-neg 11380 df-div 11808 df-nn 12175 df-2 12244 |
| This theorem is referenced by: halfpos 12407 lt2halves 12412 nominpos 12414 avgle1 12417 avgle2 12418 rehalfcld 12424 rehalfcli 12426 fldiv4lem1div2uz2 13795 efgt0 16070 sin02gt0 16159 tangtx 26469 sinq12gt0 26471 cosordlem 26494 cxpcn3lem 26711 basellem1 27044 gausslemma2dlem1a 27328 chebbnd1lem2 27433 chebbnd1lem3 27434 sin2h 37931 cos2h 37932 tan2h 37933 itg2addnclem 37992 infleinflem1 45799 fourierdlem57 46591 fourierdlem66 46600 smflimlem4 47202 |
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