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Theorem sssigagen2 29536
 Description: A subset of the generating set is also a subset of the generated sigma-algebra. (Contributed by Thierry Arnoux, 22-Sep-2017.)
Assertion
Ref Expression
sssigagen2 ((𝐴𝑉𝐵𝐴) → 𝐵 ⊆ (sigaGen‘𝐴))

Proof of Theorem sssigagen2
StepHypRef Expression
1 simpr 476 . 2 ((𝐴𝑉𝐵𝐴) → 𝐵𝐴)
2 sssigagen 29535 . . 3 (𝐴𝑉𝐴 ⊆ (sigaGen‘𝐴))
32adantr 480 . 2 ((𝐴𝑉𝐵𝐴) → 𝐴 ⊆ (sigaGen‘𝐴))
41, 3sstrd 3578 1 ((𝐴𝑉𝐵𝐴) → 𝐵 ⊆ (sigaGen‘𝐴))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 383   ∈ wcel 1977   ⊆ wss 3540  ‘cfv 5804  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-iota 5768  df-fun 5806  df-fv 5812  df-siga 29498  df-sigagen 29529 This theorem is referenced by:  sxbrsigalem5  29677
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