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Theorem bj-bdind 13299
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 13237 . . 3 BOUNDED ∅ ∈ 𝑥
2 bj-bdsucel 13251 . . . 4 BOUNDED suc 𝑦𝑥
32ax-bdal 13187 . . 3 BOUNDED𝑦𝑥 suc 𝑦𝑥
41, 3ax-bdan 13184 . 2 BOUNDED (∅ ∈ 𝑥 ∧ ∀𝑦𝑥 suc 𝑦𝑥)
5 df-bj-ind 13296 . 2 (Ind 𝑥 ↔ (∅ ∈ 𝑥 ∧ ∀𝑦𝑥 suc 𝑦𝑥))
64, 5bd0r 13194 1 BOUNDED Ind 𝑥
Colors of variables: wff set class
Syntax hints:  wa 103  wcel 1481  wral 2417  c0 3368  suc csuc 4295  BOUNDED wbd 13181  Ind wind 13295
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-io 699  ax-5 1424  ax-7 1425  ax-gen 1426  ax-ie1 1470  ax-ie2 1471  ax-8 1483  ax-10 1484  ax-11 1485  ax-i12 1486  ax-bndl 1487  ax-4 1488  ax-17 1507  ax-i9 1511  ax-ial 1515  ax-i5r 1516  ax-ext 2122  ax-bd0 13182  ax-bdim 13183  ax-bdan 13184  ax-bdor 13185  ax-bdn 13186  ax-bdal 13187  ax-bdex 13188  ax-bdeq 13189  ax-bdel 13190  ax-bdsb 13191
This theorem depends on definitions:  df-bi 116  df-tru 1335  df-fal 1338  df-nf 1438  df-sb 1737  df-clab 2127  df-cleq 2133  df-clel 2136  df-nfc 2271  df-ral 2422  df-rex 2423  df-v 2691  df-dif 3078  df-un 3080  df-in 3082  df-ss 3089  df-nul 3369  df-sn 3538  df-suc 4301  df-bdc 13210  df-bj-ind 13296
This theorem is referenced by: (None)
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