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Theorem bj-bdind 16461
Description: Boundedness of the formula "the setvar 𝑥 is an inductive class". (Contributed by BJ, 30-Nov-2019.)
Assertion
Ref Expression
bj-bdind BOUNDED Ind 𝑥

Proof of Theorem bj-bdind
Dummy variable 𝑦 is distinct from all other variables.
StepHypRef Expression
1 bj-bd0el 16399 . . 3 BOUNDED ∅ ∈ 𝑥
2 bj-bdsucel 16413 . . . 4 BOUNDED suc 𝑦𝑥
32ax-bdal 16349 . . 3 BOUNDED𝑦𝑥 suc 𝑦𝑥
41, 3ax-bdan 16346 . 2 BOUNDED (∅ ∈ 𝑥 ∧ ∀𝑦𝑥 suc 𝑦𝑥)
5 df-bj-ind 16458 . 2 (Ind 𝑥 ↔ (∅ ∈ 𝑥 ∧ ∀𝑦𝑥 suc 𝑦𝑥))
64, 5bd0r 16356 1 BOUNDED Ind 𝑥
Colors of variables: wff set class
Syntax hints:  wa 104  wcel 2200  wral 2508  c0 3492  suc csuc 4460  BOUNDED wbd 16343  Ind wind 16457
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-ext 2211  ax-bd0 16344  ax-bdim 16345  ax-bdan 16346  ax-bdor 16347  ax-bdn 16348  ax-bdal 16349  ax-bdex 16350  ax-bdeq 16351  ax-bdel 16352  ax-bdsb 16353
This theorem depends on definitions:  df-bi 117  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-rex 2514  df-v 2802  df-dif 3200  df-un 3202  df-in 3204  df-ss 3211  df-nul 3493  df-sn 3673  df-suc 4466  df-bdc 16372  df-bj-ind 16458
This theorem is referenced by: (None)
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