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Mirrors > Home > ILE Home > Th. List > xrmin1inf | GIF version |
Description: The minimum of two extended reals is less than or equal to the first. (Contributed by Jim Kingdon, 3-May-2023.) |
Ref | Expression |
---|---|
xrmin1inf | ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → inf({𝐴, 𝐵}, ℝ*, < ) ≤ 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | xrminmax 11162 | . 2 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → inf({𝐴, 𝐵}, ℝ*, < ) = -𝑒sup({-𝑒𝐴, -𝑒𝐵}, ℝ*, < )) | |
2 | xnegcl 9736 | . . . 4 ⊢ (𝐴 ∈ ℝ* → -𝑒𝐴 ∈ ℝ*) | |
3 | xnegcl 9736 | . . . 4 ⊢ (𝐵 ∈ ℝ* → -𝑒𝐵 ∈ ℝ*) | |
4 | xrmax1sup 11150 | . . . 4 ⊢ ((-𝑒𝐴 ∈ ℝ* ∧ -𝑒𝐵 ∈ ℝ*) → -𝑒𝐴 ≤ sup({-𝑒𝐴, -𝑒𝐵}, ℝ*, < )) | |
5 | 2, 3, 4 | syl2an 287 | . . 3 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → -𝑒𝐴 ≤ sup({-𝑒𝐴, -𝑒𝐵}, ℝ*, < )) |
6 | xrmaxcl 11149 | . . . . . 6 ⊢ ((-𝑒𝐴 ∈ ℝ* ∧ -𝑒𝐵 ∈ ℝ*) → sup({-𝑒𝐴, -𝑒𝐵}, ℝ*, < ) ∈ ℝ*) | |
7 | 2, 3, 6 | syl2an 287 | . . . . 5 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → sup({-𝑒𝐴, -𝑒𝐵}, ℝ*, < ) ∈ ℝ*) |
8 | xleneg 9741 | . . . . 5 ⊢ ((-𝑒𝐴 ∈ ℝ* ∧ sup({-𝑒𝐴, -𝑒𝐵}, ℝ*, < ) ∈ ℝ*) → (-𝑒𝐴 ≤ sup({-𝑒𝐴, -𝑒𝐵}, ℝ*, < ) ↔ -𝑒sup({-𝑒𝐴, -𝑒𝐵}, ℝ*, < ) ≤ -𝑒-𝑒𝐴)) | |
9 | 2, 7, 8 | syl2an2r 585 | . . . 4 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (-𝑒𝐴 ≤ sup({-𝑒𝐴, -𝑒𝐵}, ℝ*, < ) ↔ -𝑒sup({-𝑒𝐴, -𝑒𝐵}, ℝ*, < ) ≤ -𝑒-𝑒𝐴)) |
10 | xnegneg 9737 | . . . . . 6 ⊢ (𝐴 ∈ ℝ* → -𝑒-𝑒𝐴 = 𝐴) | |
11 | 10 | adantr 274 | . . . . 5 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → -𝑒-𝑒𝐴 = 𝐴) |
12 | 11 | breq2d 3977 | . . . 4 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (-𝑒sup({-𝑒𝐴, -𝑒𝐵}, ℝ*, < ) ≤ -𝑒-𝑒𝐴 ↔ -𝑒sup({-𝑒𝐴, -𝑒𝐵}, ℝ*, < ) ≤ 𝐴)) |
13 | 9, 12 | bitrd 187 | . . 3 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (-𝑒𝐴 ≤ sup({-𝑒𝐴, -𝑒𝐵}, ℝ*, < ) ↔ -𝑒sup({-𝑒𝐴, -𝑒𝐵}, ℝ*, < ) ≤ 𝐴)) |
14 | 5, 13 | mpbid 146 | . 2 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → -𝑒sup({-𝑒𝐴, -𝑒𝐵}, ℝ*, < ) ≤ 𝐴) |
15 | 1, 14 | eqbrtrd 3986 | 1 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → inf({𝐴, 𝐵}, ℝ*, < ) ≤ 𝐴) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ↔ wb 104 = wceq 1335 ∈ wcel 2128 {cpr 3561 class class class wbr 3965 supcsup 6926 infcinf 6927 ℝ*cxr 7911 < clt 7912 ≤ cle 7913 -𝑒cxne 9676 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1427 ax-7 1428 ax-gen 1429 ax-ie1 1473 ax-ie2 1474 ax-8 1484 ax-10 1485 ax-11 1486 ax-i12 1487 ax-bndl 1489 ax-4 1490 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-13 2130 ax-14 2131 ax-ext 2139 ax-coll 4079 ax-sep 4082 ax-nul 4090 ax-pow 4135 ax-pr 4169 ax-un 4393 ax-setind 4496 ax-iinf 4547 ax-cnex 7823 ax-resscn 7824 ax-1cn 7825 ax-1re 7826 ax-icn 7827 ax-addcl 7828 ax-addrcl 7829 ax-mulcl 7830 ax-mulrcl 7831 ax-addcom 7832 ax-mulcom 7833 ax-addass 7834 ax-mulass 7835 ax-distr 7836 ax-i2m1 7837 ax-0lt1 7838 ax-1rid 7839 ax-0id 7840 ax-rnegex 7841 ax-precex 7842 ax-cnre 7843 ax-pre-ltirr 7844 ax-pre-ltwlin 7845 ax-pre-lttrn 7846 ax-pre-apti 7847 ax-pre-ltadd 7848 ax-pre-mulgt0 7849 ax-pre-mulext 7850 ax-arch 7851 ax-caucvg 7852 |
This theorem depends on definitions: df-bi 116 df-dc 821 df-3or 964 df-3an 965 df-tru 1338 df-fal 1341 df-nf 1441 df-sb 1743 df-eu 2009 df-mo 2010 df-clab 2144 df-cleq 2150 df-clel 2153 df-nfc 2288 df-ne 2328 df-nel 2423 df-ral 2440 df-rex 2441 df-reu 2442 df-rmo 2443 df-rab 2444 df-v 2714 df-sbc 2938 df-csb 3032 df-dif 3104 df-un 3106 df-in 3108 df-ss 3115 df-nul 3395 df-if 3506 df-pw 3545 df-sn 3566 df-pr 3567 df-op 3569 df-uni 3773 df-int 3808 df-iun 3851 df-br 3966 df-opab 4026 df-mpt 4027 df-tr 4063 df-id 4253 df-po 4256 df-iso 4257 df-iord 4326 df-on 4328 df-ilim 4329 df-suc 4331 df-iom 4550 df-xp 4592 df-rel 4593 df-cnv 4594 df-co 4595 df-dm 4596 df-rn 4597 df-res 4598 df-ima 4599 df-iota 5135 df-fun 5172 df-fn 5173 df-f 5174 df-f1 5175 df-fo 5176 df-f1o 5177 df-fv 5178 df-isom 5179 df-riota 5780 df-ov 5827 df-oprab 5828 df-mpo 5829 df-1st 6088 df-2nd 6089 df-recs 6252 df-frec 6338 df-sup 6928 df-inf 6929 df-pnf 7914 df-mnf 7915 df-xr 7916 df-ltxr 7917 df-le 7918 df-sub 8048 df-neg 8049 df-reap 8450 df-ap 8457 df-div 8546 df-inn 8834 df-2 8892 df-3 8893 df-4 8894 df-n0 9091 df-z 9168 df-uz 9440 df-rp 9561 df-xneg 9679 df-seqfrec 10345 df-exp 10419 df-cj 10742 df-re 10743 df-im 10744 df-rsqrt 10898 df-abs 10899 |
This theorem is referenced by: bdxmet 12901 bdmopn 12904 xmettx 12910 |
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