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Theorem fri 5621
Description: A nonempty subset of an 𝑅-well-founded class has an 𝑅-minimal element (inference form). (Contributed by BJ, 16-Nov-2024.) (Proof shortened by BJ, 19-Nov-2024.)
Assertion
Ref Expression
fri (((𝐵𝐶𝑅 Fr 𝐴) ∧ (𝐵𝐴𝐵 ≠ ∅)) → ∃𝑥𝐵𝑦𝐵 ¬ 𝑦𝑅𝑥)
Distinct variable groups:   𝑥,𝑦,𝐴   𝑥,𝐵,𝑦   𝑥,𝐶,𝑦   𝑥,𝑅,𝑦

Proof of Theorem fri
StepHypRef Expression
1 simplr 780 . 2 (((𝐵𝐶𝑅 Fr 𝐴) ∧ (𝐵𝐴𝐵 ≠ ∅)) → 𝑅 Fr 𝐴)
2 simprl 782 . 2 (((𝐵𝐶𝑅 Fr 𝐴) ∧ (𝐵𝐴𝐵 ≠ ∅)) → 𝐵𝐴)
3 simpll 778 . 2 (((𝐵𝐶𝑅 Fr 𝐴) ∧ (𝐵𝐴𝐵 ≠ ∅)) → 𝐵𝐶)
4 simprr 784 . 2 (((𝐵𝐶𝑅 Fr 𝐴) ∧ (𝐵𝐴𝐵 ≠ ∅)) → 𝐵 ≠ ∅)
51, 2, 3, 4frd 5620 1 (((𝐵𝐶𝑅 Fr 𝐴) ∧ (𝐵𝐴𝐵 ≠ ∅)) → ∃𝑥𝐵𝑦𝐵 ¬ 𝑦𝑅𝑥)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wa 400  wcel 2143  wne 2958  wral 3079  wrex 3089  wss 3906  c0 4287   class class class wbr 5110   Fr wfr 5613
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-ext 2735
This theorem depends on definitions:  df-bi 210  df-an 401  df-tru 1573  df-ex 1810  df-sb 2097  df-clab 2742  df-cleq 2755  df-clel 2838  df-ne 2959  df-ral 3080  df-rex 3090  df-v 3457  df-dif 3909  df-ss 3923  df-pw 4565  df-sn 4591  df-fr 5616
This theorem is referenced by:  frc  5626  fr2nr  5640  frminex  5642  wereu  5659  wereu2  5660  frpomin  6343  fr3nr  7772  frfi  9246  fimax2g  9247  fimin2g  9460  wofib  9508  wemapso  9514  wemapso2lem  9515  noinfep  9630  cflim2  10248  isfin1-3  10371  fin12  10398  fpwwe2lem11  10627  fpwwe2lem12  10628  fpwwe2  10629  bnj110  35224  frinfm  38364  fdc  38374  fnwe2lem2  43758  sswfaxreg  45676
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