Theorem sgsiga 34155

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 34154	. 2 ⊢ (𝐴 ∈ 𝑉 → (sigaGen‘𝐴) ∈ (sigAlgebra‘∪ 𝐴))
3		elrnsiga 34139	. 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 2111  ∪ cuni 4856  ran crn 5615  ‘cfv 6481  sigAlgebracsiga 34121  sigaGencsigagen 34151

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2113  ax-9 2121  ax-10 2144  ax-11 2160  ax-12 2180  ax-ext 2703  ax-sep 5232  ax-nul 5242  ax-pow 5301  ax-pr 5368  ax-un 7668

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-nf 1785  df-sb 2068  df-mo 2535  df-eu 2564  df-clab 2710  df-cleq 2723  df-clel 2806  df-nfc 2881  df-ne 2929  df-ral 3048  df-rex 3057  df-rab 3396  df-v 3438  df-sbc 3737  df-csb 3846  df-dif 3900  df-un 3902  df-in 3904  df-ss 3914  df-nul 4281  df-if 4473  df-pw 4549  df-sn 4574  df-pr 4576  df-op 4580  df-uni 4857  df-int 4896  df-br 5090  df-opab 5152  df-mpt 5171  df-id 5509  df-xp 5620  df-rel 5621  df-cnv 5622  df-co 5623  df-dm 5624  df-rn 5625  df-iota 6437  df-fun 6483  df-fv 6489  df-siga 34122  df-sigagen 34152

This theorem is referenced by:  elsigagen2  34161  cldssbrsiga  34200  imambfm  34275  sxbrsigalem2  34299  sxbrsiga  34303  sibf0  34347  sibff  34349  sibfinima  34352  sibfof  34353  sitgclg  34355  orvcval4  34474  orvcoel  34475  orvccel  34476