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Theorem unisalgen2 45647
Description: The union of a set belongs is equal to the union of the sigma-algebra generated by the set. (Contributed by Glauco Siliprandi, 26-Jun-2021.)
Hypotheses
Ref Expression
unisalgen2.x (πœ‘ β†’ 𝐴 ∈ 𝑉)
unisalgen2.s 𝑆 = (SalGenβ€˜π΄)
Assertion
Ref Expression
unisalgen2 (πœ‘ β†’ βˆͺ 𝑆 = βˆͺ 𝐴)

Proof of Theorem unisalgen2
Dummy variable π‘₯ is distinct from all other variables.
StepHypRef Expression
1 unisalgen2.s . . . . . 6 𝑆 = (SalGenβ€˜π΄)
21eqcomi 2735 . . . . 5 (SalGenβ€˜π΄) = 𝑆
32a1i 11 . . . 4 (πœ‘ β†’ (SalGenβ€˜π΄) = 𝑆)
4 unisalgen2.x . . . . 5 (πœ‘ β†’ 𝐴 ∈ 𝑉)
54dfsalgen2 45634 . . . 4 (πœ‘ β†’ ((SalGenβ€˜π΄) = 𝑆 ↔ ((𝑆 ∈ SAlg ∧ βˆͺ 𝑆 = βˆͺ 𝐴 ∧ 𝐴 βŠ† 𝑆) ∧ βˆ€π‘₯ ∈ SAlg ((βˆͺ π‘₯ = βˆͺ 𝐴 ∧ 𝐴 βŠ† π‘₯) β†’ 𝑆 βŠ† π‘₯))))
63, 5mpbid 231 . . 3 (πœ‘ β†’ ((𝑆 ∈ SAlg ∧ βˆͺ 𝑆 = βˆͺ 𝐴 ∧ 𝐴 βŠ† 𝑆) ∧ βˆ€π‘₯ ∈ SAlg ((βˆͺ π‘₯ = βˆͺ 𝐴 ∧ 𝐴 βŠ† π‘₯) β†’ 𝑆 βŠ† π‘₯)))
76simpld 494 . 2 (πœ‘ β†’ (𝑆 ∈ SAlg ∧ βˆͺ 𝑆 = βˆͺ 𝐴 ∧ 𝐴 βŠ† 𝑆))
87simp2d 1140 1 (πœ‘ β†’ βˆͺ 𝑆 = βˆͺ 𝐴)
Colors of variables: wff setvar class
Syntax hints:   β†’ wi 4   ∧ wa 395   ∧ w3a 1084   = wceq 1533   ∈ wcel 2098  βˆ€wral 3055   βŠ† wss 3943  βˆͺ cuni 4902  β€˜cfv 6537  SAlgcsalg 45601  SalGencsalgen 45605
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1905  ax-6 1963  ax-7 2003  ax-8 2100  ax-9 2108  ax-10 2129  ax-11 2146  ax-12 2163  ax-ext 2697  ax-sep 5292  ax-nul 5299  ax-pow 5356  ax-pr 5420  ax-un 7722
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 845  df-3an 1086  df-tru 1536  df-fal 1546  df-ex 1774  df-nf 1778  df-sb 2060  df-mo 2528  df-eu 2557  df-clab 2704  df-cleq 2718  df-clel 2804  df-nfc 2879  df-ne 2935  df-ral 3056  df-rex 3065  df-rab 3427  df-v 3470  df-sbc 3773  df-csb 3889  df-dif 3946  df-un 3948  df-in 3950  df-ss 3960  df-nul 4318  df-if 4524  df-pw 4599  df-sn 4624  df-pr 4626  df-op 4630  df-uni 4903  df-int 4944  df-br 5142  df-opab 5204  df-mpt 5225  df-id 5567  df-xp 5675  df-rel 5676  df-cnv 5677  df-co 5678  df-dm 5679  df-iota 6489  df-fun 6539  df-fv 6545  df-salg 45602  df-salgen 45606
This theorem is referenced by:  incsmf  46035  decsmf  46060
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