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Theorem nfinf 9459
Description: Hypothesis builder for infimum. (Contributed by AV, 2-Sep-2020.)
Hypotheses
Ref Expression
nfinf.1 Ⅎ𝑥𝐴
nfinf.2 Ⅎ𝑥𝐵
nfinf.3 Ⅎ𝑥𝑅
Assertion
Ref Expression
nfinf Ⅎ𝑥inf(𝐴, 𝐵, 𝑅)

Proof of Theorem nfinf
StepHypRef Expression
1 df-inf 9419 . 2 inf(𝐴, 𝐵, 𝑅) = sup(𝐴, 𝐵, ◡𝑅)
2 nfinf.1 . . 3 Ⅎ𝑥𝐴
3 nfinf.2 . . 3 Ⅎ𝑥𝐵
4 nfinf.3 . . . 4 Ⅎ𝑥𝑅
54nfcnv 5856 . . 3 Ⅎ𝑥◡𝑅
62, 3, 5nfsup 9427 . 2 Ⅎ𝑥sup(𝐴, 𝐵, ◡𝑅)
71, 6nfcxfr 2921 1 Ⅎ𝑥inf(𝐴, 𝐵, 𝑅)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  Ⅎwnfc 2908  ◡ccnv 5650  supcsup 9416  infcinf 9417
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
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ral 3078  df-rex 3088  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-xp 5657  df-cnv 5659  df-dm 5661  df-rn 5662  df-res 5663  df-ima 5664  df-sup 9418  df-inf 9419
This theorem is used by:  iundisj  25849  iundisjf  33165  iundisjfi  33370  nfwsuc  36550  nfwlim  36554  allbutfiinf  46374  infrpgernmpt  46419  liminflelimsuplem  46729  stoweidlem62  47016  fourierdlem31  47092  iunhoiioolem  47629  smfinf  47772  prmdvdsfmtnof1lem1  48613
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