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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 7431 | . . . 4 ⊢ (𝐴 = 0 → (𝐴 /e 𝐵) = (0 /e 𝐵)) | |
| 2 | xrpxdivcld.2 | . . . . 5 ⊢ (𝜑 → 𝐵 ∈ ℝ+) | |
| 3 | xdiv0rp 33546 | . . . . 5 ⊢ (𝐵 ∈ ℝ+ → (0 /e 𝐵) = 0) | |
| 4 | 2, 3 | syl 18 | . . . 4 ⊢ (𝜑 → (0 /e 𝐵) = 0) |
| 5 | 1, 4 | sylan9eqr 2817 | . . 3 ⊢ ((𝜑 ∧ 𝐴 = 0) → (𝐴 /e 𝐵) = 0) |
| 6 | elxrge02 33548 | . . . . 5 ⊢ ((𝐴 /e 𝐵) ∈ (0[,]+∞) ↔ ((𝐴 /e 𝐵) = 0 ∨ (𝐴 /e 𝐵) ∈ ℝ+ ∨ (𝐴 /e 𝐵) = +∞)) | |
| 7 | 6 | biimpri 231 | . . . 4 ⊢ (((𝐴 /e 𝐵) = 0 ∨ (𝐴 /e 𝐵) ∈ ℝ+ ∨ (𝐴 /e 𝐵) = +∞) → (𝐴 /e 𝐵) ∈ (0[,]+∞)) |
| 8 | 7 | 3o1cs 33110 | . . 3 ⊢ ((𝐴 /e 𝐵) = 0 → (𝐴 /e 𝐵) ∈ (0[,]+∞)) |
| 9 | 5, 8 | syl 18 | . 2 ⊢ ((𝜑 ∧ 𝐴 = 0) → (𝐴 /e 𝐵) ∈ (0[,]+∞)) |
| 10 | simpr 490 | . . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ ℝ+) → 𝐴 ∈ ℝ+) | |
| 11 | 2 | adantr 486 | . . . 4 ⊢ ((𝜑 ∧ 𝐴 ∈ ℝ+) → 𝐵 ∈ ℝ+) |
| 12 | 10, 11 | rpxdivcld 33550 | . . 3 ⊢ ((𝜑 ∧ 𝐴 ∈ ℝ+) → (𝐴 /e 𝐵) ∈ ℝ+) |
| 13 | 7 | 3o2cs 33111 | . . 3 ⊢ ((𝐴 /e 𝐵) ∈ ℝ+ → (𝐴 /e 𝐵) ∈ (0[,]+∞)) |
| 14 | 12, 13 | syl 18 | . 2 ⊢ ((𝜑 ∧ 𝐴 ∈ ℝ+) → (𝐴 /e 𝐵) ∈ (0[,]+∞)) |
| 15 | oveq1 7431 | . . . 4 ⊢ (𝐴 = +∞ → (𝐴 /e 𝐵) = (+∞ /e 𝐵)) | |
| 16 | xdivpnfrp 33549 | . . . . 5 ⊢ (𝐵 ∈ ℝ+ → (+∞ /e 𝐵) = +∞) | |
| 17 | 2, 16 | syl 18 | . . . 4 ⊢ (𝜑 → (+∞ /e 𝐵) = +∞) |
| 18 | 15, 17 | sylan9eqr 2817 | . . 3 ⊢ ((𝜑 ∧ 𝐴 = +∞) → (𝐴 /e 𝐵) = +∞) |
| 19 | 7 | 3o3cs 33112 | . . 3 ⊢ ((𝐴 /e 𝐵) = +∞ → (𝐴 /e 𝐵) ∈ (0[,]+∞)) |
| 20 | 18, 19 | syl 18 | . 2 ⊢ ((𝜑 ∧ 𝐴 = +∞) → (𝐴 /e 𝐵) ∈ (0[,]+∞)) |
| 21 | xrpxdivcld.1 | . . 3 ⊢ (𝜑 → 𝐴 ∈ (0[,]+∞)) | |
| 22 | elxrge02 33548 | . . 3 ⊢ (𝐴 ∈ (0[,]+∞) ↔ (𝐴 = 0 ∨ 𝐴 ∈ ℝ+ ∨ 𝐴 = +∞)) | |
| 23 | 21, 22 | sylib 221 | . 2 ⊢ (𝜑 → (𝐴 = 0 ∨ 𝐴 ∈ ℝ+ ∨ 𝐴 = +∞)) |
| 24 | 9, 14, 20, 23 | mpjao3dan 1459 | 1 ⊢ (𝜑 → (𝐴 /e 𝐵) ∈ (0[,]+∞)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∨ w3o 1102 = wceq 1569 ∈ wcel 2144 (class class class)co 7424 0cc0 11207 +∞cpnf 11347 ℝ+crp 13127 [,]cicc 13486 /e cxdiv 33533 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pow 5327 ax-pr 5391 ax-un 7755 ax-cnex 11263 ax-resscn 11264 ax-1cn 11265 ax-icn 11266 ax-addcl 11267 ax-addrcl 11268 ax-mulcl 11269 ax-mulrcl 11270 ax-mulcom 11271 ax-addass 11272 ax-mulass 11273 ax-distr 11274 ax-i2m1 11275 ax-1ne0 11276 ax-1rid 11277 ax-rnegex 11278 ax-rrecex 11279 ax-cnre 11280 ax-pre-lttri 11281 ax-pre-lttrn 11282 ax-pre-ltadd 11283 ax-pre-mulgt0 11284 ax-pre-sup 11285 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3848 df-ss 3897 df-pss 4013 df-dif 4046 df-in 4090 df-un 4150 df-nul 4278 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6307 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6497 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7381 df-ov 7427 df-oprab 7428 df-mpo 7429 df-om 7882 df-1st 8005 df-2nd 8006 df-frecs 8307 df-wrecs 8338 df-recs 8387 df-rdg 8426 df-er 8725 df-en 8982 df-dom 8983 df-sdom 8984 df-sup 9441 df-inf 9442 df-pnf 11352 df-mnf 11353 df-xr 11354 df-ltxr 11355 df-le 11356 df-sub 11550 df-neg 11551 df-div 11981 df-nn 12343 df-n0 12614 df-z 12701 df-uz 12973 df-q 13083 df-rp 13128 df-xneg 13248 df-xmul 13250 df-ioo 13487 df-ico 13489 df-icc 13490 df-xdiv 33534 |
| This theorem is used by: measdivcst 34907 measdivcstALTV 34908 |
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