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Theorem sigagenid 29541
 Description: The sigma-algebra generated by a sigma-algebra is itself. (Contributed by Thierry Arnoux, 4-Jun-2017.)
Assertion
Ref Expression
sigagenid (𝑆 ran sigAlgebra → (sigaGen‘𝑆) = 𝑆)

Proof of Theorem sigagenid
StepHypRef Expression
1 sgon 29514 . . 3 (𝑆 ran sigAlgebra → 𝑆 ∈ (sigAlgebra‘ 𝑆))
2 ssid 3587 . . 3 𝑆𝑆
3 sigagenss 29539 . . 3 ((𝑆 ∈ (sigAlgebra‘ 𝑆) ∧ 𝑆𝑆) → (sigaGen‘𝑆) ⊆ 𝑆)
41, 2, 3sylancl 693 . 2 (𝑆 ran sigAlgebra → (sigaGen‘𝑆) ⊆ 𝑆)
5 sssigagen 29535 . 2 (𝑆 ran sigAlgebra → 𝑆 ⊆ (sigaGen‘𝑆))
64, 5eqssd 3585 1 (𝑆 ran sigAlgebra → (sigaGen‘𝑆) = 𝑆)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   = wceq 1475   ∈ wcel 1977   ⊆ wss 3540  ∪ cuni 4372  ran crn 5039  ‘cfv 5804  sigAlgebracsiga 29497  sigaGencsigagen 29528 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847 This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3an 1033  df-tru 1478  df-fal 1481  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-ral 2901  df-rex 2902  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-op 4132  df-uni 4373  df-int 4411  df-br 4584  df-opab 4644  df-mpt 4645  df-id 4953  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-iota 5768  df-fun 5806  df-fn 5807  df-fv 5812  df-siga 29498  df-sigagen 29529 This theorem is referenced by: (None)
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