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Theorem infexd 9476
Description: An infimum is a set. (Contributed by AV, 2-Sep-2020.)
Hypothesis
Ref Expression
infexd.1 (𝜑 → 𝑅 Or 𝐴)
Assertion
Ref Expression
infexd (𝜑 → inf(𝐵, 𝐴, 𝑅) ∈ V)

Proof of Theorem infexd
StepHypRef Expression
1 df-inf 9435 . 2 inf(𝐵, 𝐴, 𝑅) = sup(𝐵, 𝐴, ◡𝑅)
2 infexd.1 . . . 4 (𝜑 → 𝑅 Or 𝐴)
3 cnvso 6291 . . . 4 (𝑅 Or 𝐴 ↔ ◡𝑅 Or 𝐴)
42, 3sylib 221 . . 3 (𝜑 → ◡𝑅 Or 𝐴)
54supexd 9445 . 2 (𝜑 → sup(𝐵, 𝐴, ◡𝑅) ∈ V)
61, 5eqeltrid 2865 1 (𝜑 → inf(𝐵, 𝐴, 𝑅) ∈ V)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ∈ wcel 2145  Vcvv 3451   Or wor 5558  ◡ccnv 5650  supcsup 9432  infcinf 9433
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2733  ax-sep 5249  ax-pr 5391  ax-un 7751
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2565  df-clab 2740  df-cleq 2753  df-clel 2836  df-ne 2957  df-ral 3078  df-rex 3088  df-rmo 3366  df-rab 3414  df-v 3453  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5104  df-opab 5168  df-po 5559  df-so 5560  df-cnv 5659  df-sup 9434  df-inf 9435
This theorem is used by:  infex  9487  omsfval  34926  wsucex  36588  prproropf1olem4  48587  prmdvdsfmtnof1  48671
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