Mathbox for Thierry Arnoux |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > xrpxdivcld | Structured version Visualization version GIF version |
Description: Closure law for extended division of positive extended reals. (Contributed by Thierry Arnoux, 18-Dec-2016.) |
Ref | Expression |
---|---|
xrpxdivcld.1 | ⊢ (𝜑 → 𝐴 ∈ (0[,]+∞)) |
xrpxdivcld.2 | ⊢ (𝜑 → 𝐵 ∈ ℝ+) |
Ref | Expression |
---|---|
xrpxdivcld | ⊢ (𝜑 → (𝐴 /𝑒 𝐵) ∈ (0[,]+∞)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | oveq1 7282 | . . . 4 ⊢ (𝐴 = 0 → (𝐴 /𝑒 𝐵) = (0 /𝑒 𝐵)) | |
2 | xrpxdivcld.2 | . . . . 5 ⊢ (𝜑 → 𝐵 ∈ ℝ+) | |
3 | xdiv0rp 31204 | . . . . 5 ⊢ (𝐵 ∈ ℝ+ → (0 /𝑒 𝐵) = 0) | |
4 | 2, 3 | syl 17 | . . . 4 ⊢ (𝜑 → (0 /𝑒 𝐵) = 0) |
5 | 1, 4 | sylan9eqr 2800 | . . 3 ⊢ ((𝜑 ∧ 𝐴 = 0) → (𝐴 /𝑒 𝐵) = 0) |
6 | elxrge02 31206 | . . . . 5 ⊢ ((𝐴 /𝑒 𝐵) ∈ (0[,]+∞) ↔ ((𝐴 /𝑒 𝐵) = 0 ∨ (𝐴 /𝑒 𝐵) ∈ ℝ+ ∨ (𝐴 /𝑒 𝐵) = +∞)) | |
7 | 6 | biimpri 227 | . . . 4 ⊢ (((𝐴 /𝑒 𝐵) = 0 ∨ (𝐴 /𝑒 𝐵) ∈ ℝ+ ∨ (𝐴 /𝑒 𝐵) = +∞) → (𝐴 /𝑒 𝐵) ∈ (0[,]+∞)) |
8 | 7 | 3o1cs 30812 | . . 3 ⊢ ((𝐴 /𝑒 𝐵) = 0 → (𝐴 /𝑒 𝐵) ∈ (0[,]+∞)) |
9 | 5, 8 | syl 17 | . 2 ⊢ ((𝜑 ∧ 𝐴 = 0) → (𝐴 /𝑒 𝐵) ∈ (0[,]+∞)) |
10 | simpr 485 | . . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ ℝ+) → 𝐴 ∈ ℝ+) | |
11 | 2 | adantr 481 | . . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ ℝ+) → 𝐵 ∈ ℝ+) |
12 | 10, 11 | rpxdivcld 31208 | . . 3 ⊢ ((𝜑 ∧ 𝐴 ∈ ℝ+) → (𝐴 /𝑒 𝐵) ∈ ℝ+) |
13 | 7 | 3o2cs 30813 | . . 3 ⊢ ((𝐴 /𝑒 𝐵) ∈ ℝ+ → (𝐴 /𝑒 𝐵) ∈ (0[,]+∞)) |
14 | 12, 13 | syl 17 | . 2 ⊢ ((𝜑 ∧ 𝐴 ∈ ℝ+) → (𝐴 /𝑒 𝐵) ∈ (0[,]+∞)) |
15 | oveq1 7282 | . . . 4 ⊢ (𝐴 = +∞ → (𝐴 /𝑒 𝐵) = (+∞ /𝑒 𝐵)) | |
16 | xdivpnfrp 31207 | . . . . 5 ⊢ (𝐵 ∈ ℝ+ → (+∞ /𝑒 𝐵) = +∞) | |
17 | 2, 16 | syl 17 | . . . 4 ⊢ (𝜑 → (+∞ /𝑒 𝐵) = +∞) |
18 | 15, 17 | sylan9eqr 2800 | . . 3 ⊢ ((𝜑 ∧ 𝐴 = +∞) → (𝐴 /𝑒 𝐵) = +∞) |
19 | 7 | 3o3cs 30814 | . . 3 ⊢ ((𝐴 /𝑒 𝐵) = +∞ → (𝐴 /𝑒 𝐵) ∈ (0[,]+∞)) |
20 | 18, 19 | syl 17 | . 2 ⊢ ((𝜑 ∧ 𝐴 = +∞) → (𝐴 /𝑒 𝐵) ∈ (0[,]+∞)) |
21 | xrpxdivcld.1 | . . 3 ⊢ (𝜑 → 𝐴 ∈ (0[,]+∞)) | |
22 | elxrge02 31206 | . . 3 ⊢ (𝐴 ∈ (0[,]+∞) ↔ (𝐴 = 0 ∨ 𝐴 ∈ ℝ+ ∨ 𝐴 = +∞)) | |
23 | 21, 22 | sylib 217 | . 2 ⊢ (𝜑 → (𝐴 = 0 ∨ 𝐴 ∈ ℝ+ ∨ 𝐴 = +∞)) |
24 | 9, 14, 20, 23 | mpjao3dan 1430 | 1 ⊢ (𝜑 → (𝐴 /𝑒 𝐵) ∈ (0[,]+∞)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 396 ∨ w3o 1085 = wceq 1539 ∈ wcel 2106 (class class class)co 7275 0cc0 10871 +∞cpnf 11006 ℝ+crp 12730 [,]cicc 13082 /𝑒 cxdiv 31191 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-sep 5223 ax-nul 5230 ax-pow 5288 ax-pr 5352 ax-un 7588 ax-cnex 10927 ax-resscn 10928 ax-1cn 10929 ax-icn 10930 ax-addcl 10931 ax-addrcl 10932 ax-mulcl 10933 ax-mulrcl 10934 ax-mulcom 10935 ax-addass 10936 ax-mulass 10937 ax-distr 10938 ax-i2m1 10939 ax-1ne0 10940 ax-1rid 10941 ax-rnegex 10942 ax-rrecex 10943 ax-cnre 10944 ax-pre-lttri 10945 ax-pre-lttrn 10946 ax-pre-ltadd 10947 ax-pre-mulgt0 10948 ax-pre-sup 10949 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ne 2944 df-nel 3050 df-ral 3069 df-rex 3070 df-rmo 3071 df-reu 3072 df-rab 3073 df-v 3434 df-sbc 3717 df-csb 3833 df-dif 3890 df-un 3892 df-in 3894 df-ss 3904 df-pss 3906 df-nul 4257 df-if 4460 df-pw 4535 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4840 df-iun 4926 df-br 5075 df-opab 5137 df-mpt 5158 df-tr 5192 df-id 5489 df-eprel 5495 df-po 5503 df-so 5504 df-fr 5544 df-we 5546 df-xp 5595 df-rel 5596 df-cnv 5597 df-co 5598 df-dm 5599 df-rn 5600 df-res 5601 df-ima 5602 df-pred 6202 df-ord 6269 df-on 6270 df-lim 6271 df-suc 6272 df-iota 6391 df-fun 6435 df-fn 6436 df-f 6437 df-f1 6438 df-fo 6439 df-f1o 6440 df-fv 6441 df-riota 7232 df-ov 7278 df-oprab 7279 df-mpo 7280 df-om 7713 df-1st 7831 df-2nd 7832 df-frecs 8097 df-wrecs 8128 df-recs 8202 df-rdg 8241 df-er 8498 df-en 8734 df-dom 8735 df-sdom 8736 df-sup 9201 df-inf 9202 df-pnf 11011 df-mnf 11012 df-xr 11013 df-ltxr 11014 df-le 11015 df-sub 11207 df-neg 11208 df-div 11633 df-nn 11974 df-n0 12234 df-z 12320 df-uz 12583 df-q 12689 df-rp 12731 df-xneg 12848 df-xmul 12850 df-ioo 13083 df-ico 13085 df-icc 13086 df-xdiv 31192 |
This theorem is referenced by: measdivcst 32192 measdivcstALTV 32193 |
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