Theorem sgsiga 33135

Description: A generated sigma-algebra is a sigma-algebra. (Contributed by Thierry Arnoux, 30-Jan-2017.)

Hypothesis

Ref	Expression
sgsiga.1	⊢ (𝜑 → 𝐴 ∈ 𝑉)

Assertion

Ref	Expression
sgsiga	⊢ (𝜑 → (sigaGen‘𝐴) ∈ ∪ ran sigAlgebra)

Proof of Theorem sgsiga

Step	Hyp	Ref	Expression
1		sgsiga.1	. 2 ⊢ (𝜑 → 𝐴 ∈ 𝑉)
2		sigagensiga 33134	. 2 ⊢ (𝐴 ∈ 𝑉 → (sigaGen‘𝐴) ∈ (sigAlgebra‘∪ 𝐴))
3		elrnsiga 33119	. 2 ⊢ ((sigaGen‘𝐴) ∈ (sigAlgebra‘∪ 𝐴) → (sigaGen‘𝐴) ∈ ∪ ran sigAlgebra)
4	1, 2, 3	3syl 18	1 ⊢ (𝜑 → (sigaGen‘𝐴) ∈ ∪ ran sigAlgebra)

Syntax hints:   → wi 4   ∈ wcel 2106  ∪ cuni 4908  ran crn 5677  ‘cfv 6543  sigAlgebracsiga 33101  sigaGencsigagen 33131

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2703  ax-sep 5299  ax-nul 5306  ax-pow 5363  ax-pr 5427  ax-un 7724

This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-nf 1786  df-sb 2068  df-mo 2534  df-eu 2563  df-clab 2710  df-cleq 2724  df-clel 2810  df-nfc 2885  df-ne 2941  df-ral 3062  df-rex 3071  df-rab 3433  df-v 3476  df-sbc 3778  df-csb 3894  df-dif 3951  df-un 3953  df-in 3955  df-ss 3965  df-nul 4323  df-if 4529  df-pw 4604  df-sn 4629  df-pr 4631  df-op 4635  df-uni 4909  df-int 4951  df-br 5149  df-opab 5211  df-mpt 5232  df-id 5574  df-xp 5682  df-rel 5683  df-cnv 5684  df-co 5685  df-dm 5686  df-rn 5687  df-iota 6495  df-fun 6545  df-fv 6551  df-siga 33102  df-sigagen 33132

This theorem is referenced by:  elsigagen2  33141  cldssbrsiga  33180  imambfm  33256  sxbrsigalem2  33280  sxbrsiga  33284  sibf0  33328  sibff  33330  sibfinima  33333  sibfof  33334  sitgclg  33336  orvcval4  33454  orvcoel  33455  orvccel  33456