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Theorem infltoreq 9499
Description: The infimum of a finite set is less than or equal to all the elements of the set. (Contributed by AV, 4-Sep-2020.)
Hypotheses
Ref Expression
infltoreq.1 (𝜑𝑅 Or 𝐴)
infltoreq.2 (𝜑𝐵𝐴)
infltoreq.3 (𝜑𝐵 ∈ Fin)
infltoreq.4 (𝜑𝐶𝐵)
infltoreq.5 (𝜑𝑆 = inf(𝐵, 𝐴, 𝑅))
Assertion
Ref Expression
infltoreq (𝜑 → (𝑆𝑅𝐶𝐶 = 𝑆))

Proof of Theorem infltoreq
StepHypRef Expression
1 infltoreq.1 . . . 4 (𝜑𝑅 Or 𝐴)
2 cnvso 6281 . . . 4 (𝑅 Or 𝐴𝑅 Or 𝐴)
31, 2sylib 217 . . 3 (𝜑𝑅 Or 𝐴)
4 infltoreq.2 . . 3 (𝜑𝐵𝐴)
5 infltoreq.3 . . 3 (𝜑𝐵 ∈ Fin)
6 infltoreq.4 . . 3 (𝜑𝐶𝐵)
7 infltoreq.5 . . . 4 (𝜑𝑆 = inf(𝐵, 𝐴, 𝑅))
8 df-inf 9440 . . . 4 inf(𝐵, 𝐴, 𝑅) = sup(𝐵, 𝐴, 𝑅)
97, 8eqtrdi 2782 . . 3 (𝜑𝑆 = sup(𝐵, 𝐴, 𝑅))
103, 4, 5, 6, 9supgtoreq 9467 . 2 (𝜑 → (𝐶𝑅𝑆𝐶 = 𝑆))
116ne0d 4330 . . . . . 6 (𝜑𝐵 ≠ ∅)
12 fiinfcl 9498 . . . . . 6 ((𝑅 Or 𝐴 ∧ (𝐵 ∈ Fin ∧ 𝐵 ≠ ∅ ∧ 𝐵𝐴)) → inf(𝐵, 𝐴, 𝑅) ∈ 𝐵)
131, 5, 11, 4, 12syl13anc 1369 . . . . 5 (𝜑 → inf(𝐵, 𝐴, 𝑅) ∈ 𝐵)
147, 13eqeltrd 2827 . . . 4 (𝜑𝑆𝐵)
15 brcnvg 5873 . . . . 5 ((𝐶𝐵𝑆𝐵) → (𝐶𝑅𝑆𝑆𝑅𝐶))
1615bicomd 222 . . . 4 ((𝐶𝐵𝑆𝐵) → (𝑆𝑅𝐶𝐶𝑅𝑆))
176, 14, 16syl2anc 583 . . 3 (𝜑 → (𝑆𝑅𝐶𝐶𝑅𝑆))
1817orbi1d 913 . 2 (𝜑 → ((𝑆𝑅𝐶𝐶 = 𝑆) ↔ (𝐶𝑅𝑆𝐶 = 𝑆)))
1910, 18mpbird 257 1 (𝜑 → (𝑆𝑅𝐶𝐶 = 𝑆))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wa 395  wo 844   = wceq 1533  wcel 2098  wne 2934  wss 3943  c0 4317   class class class wbr 5141   Or wor 5580  ccnv 5668  Fincfn 8941  supcsup 9437  infcinf 9438
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1905  ax-6 1963  ax-7 2003  ax-8 2100  ax-9 2108  ax-10 2129  ax-11 2146  ax-12 2163  ax-ext 2697  ax-sep 5292  ax-nul 5299  ax-pr 5420  ax-un 7722
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 845  df-3or 1085  df-3an 1086  df-tru 1536  df-fal 1546  df-ex 1774  df-nf 1778  df-sb 2060  df-mo 2528  df-eu 2557  df-clab 2704  df-cleq 2718  df-clel 2804  df-nfc 2879  df-ne 2935  df-ral 3056  df-rex 3065  df-rmo 3370  df-reu 3371  df-rab 3427  df-v 3470  df-sbc 3773  df-dif 3946  df-un 3948  df-in 3950  df-ss 3960  df-pss 3962  df-nul 4318  df-if 4524  df-pw 4599  df-sn 4624  df-pr 4626  df-op 4630  df-uni 4903  df-br 5142  df-opab 5204  df-tr 5259  df-id 5567  df-eprel 5573  df-po 5581  df-so 5582  df-fr 5624  df-we 5626  df-xp 5675  df-rel 5676  df-cnv 5677  df-co 5678  df-dm 5679  df-rn 5680  df-res 5681  df-ima 5682  df-ord 6361  df-on 6362  df-lim 6363  df-suc 6364  df-iota 6489  df-fun 6539  df-fn 6540  df-f 6541  df-f1 6542  df-fo 6543  df-f1o 6544  df-fv 6545  df-riota 7361  df-om 7853  df-en 8942  df-fin 8945  df-sup 9439  df-inf 9440
This theorem is referenced by: (None)
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