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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 11714 | . 2 ⊢ 2 ∈ ℝ | |
2 | 2ne0 11744 | . 2 ⊢ 2 ≠ 0 | |
3 | redivcl 11361 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 2 ∈ ℝ ∧ 2 ≠ 0) → (𝐴 / 2) ∈ ℝ) | |
4 | 1, 2, 3 | mp3an23 1449 | 1 ⊢ (𝐴 ∈ ℝ → (𝐴 / 2) ∈ ℝ) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∈ wcel 2114 ≠ wne 3018 (class class class)co 7158 ℝcr 10538 0cc0 10539 / cdiv 11299 2c2 11695 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-sep 5205 ax-nul 5212 ax-pow 5268 ax-pr 5332 ax-un 7463 ax-resscn 10596 ax-1cn 10597 ax-icn 10598 ax-addcl 10599 ax-addrcl 10600 ax-mulcl 10601 ax-mulrcl 10602 ax-mulcom 10603 ax-addass 10604 ax-mulass 10605 ax-distr 10606 ax-i2m1 10607 ax-1ne0 10608 ax-1rid 10609 ax-rnegex 10610 ax-rrecex 10611 ax-cnre 10612 ax-pre-lttri 10613 ax-pre-lttrn 10614 ax-pre-ltadd 10615 ax-pre-mulgt0 10616 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ne 3019 df-nel 3126 df-ral 3145 df-rex 3146 df-reu 3147 df-rmo 3148 df-rab 3149 df-v 3498 df-sbc 3775 df-csb 3886 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-nul 4294 df-if 4470 df-pw 4543 df-sn 4570 df-pr 4572 df-op 4576 df-uni 4841 df-br 5069 df-opab 5131 df-mpt 5149 df-id 5462 df-po 5476 df-so 5477 df-xp 5563 df-rel 5564 df-cnv 5565 df-co 5566 df-dm 5567 df-rn 5568 df-res 5569 df-ima 5570 df-iota 6316 df-fun 6359 df-fn 6360 df-f 6361 df-f1 6362 df-fo 6363 df-f1o 6364 df-fv 6365 df-riota 7116 df-ov 7161 df-oprab 7162 df-mpo 7163 df-er 8291 df-en 8512 df-dom 8513 df-sdom 8514 df-pnf 10679 df-mnf 10680 df-xr 10681 df-ltxr 10682 df-le 10683 df-sub 10874 df-neg 10875 df-div 11300 df-2 11703 |
This theorem is referenced by: halfpos 11870 lt2halves 11875 nominpos 11877 avgle1 11880 avgle2 11881 rehalfcld 11887 rehalfcli 11889 fldiv4lem1div2uz2 13209 efgt0 15458 sin02gt0 15547 tangtx 25093 sinq12gt0 25095 cosordlem 25117 cxpcn3lem 25330 basellem1 25660 gausslemma2dlem1a 25943 chebbnd1lem2 26048 chebbnd1lem3 26049 sin2h 34884 cos2h 34885 tan2h 34886 itg2addnclem 34945 infleinflem1 41645 fourierdlem57 42455 fourierdlem66 42464 smflimlem4 43057 |
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