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[Merged by Bors] - feat: f i * f j, f k * f l are independent if f is #8971

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@YaelDillies YaelDillies commented Dec 11, 2023

Also prove that a subsingleton family is always independent and that an independent family implies the measure is a probability measure.

This latter result means we can drop IsProbabilityMeasure μ assumptions from many theorems.

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Also prove that a subsingleton family is always independent and that an independent family imples the measure is a probability measure.

This latter result means we can drop `IsProbabilityMeasure μ` assumptions from many theorems.
@YaelDillies YaelDillies added awaiting-review The author would like community review of the PR t-measure-probability Measure theory / Probability theory labels Dec 11, 2023
variable {m : ∀ i, MeasurableSpace (κ i)} {f : ∀ i, Ω → κ i}

@[nontriviality]
lemma iIndepFun.of_subsingleton [IsProbabilityMeasure μ] [Subsingleton ι] : iIndepFun m f μ :=
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Out of scope, but: this should be IIndepFun, right?

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Maybe, unclear. Might be better as IndepFuns

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bors r+
Thanks!

@github-actions github-actions bot added ready-to-merge This PR has been sent to bors. and removed awaiting-review The author would like community review of the PR labels Dec 20, 2023
mathlib-bors bot pushed a commit that referenced this pull request Dec 20, 2023
Also prove that a subsingleton family is always independent and that an independent family implies the measure is a probability measure.

This latter result means we can drop `IsProbabilityMeasure μ` assumptions from many theorems.

From PFR




Co-authored-by: sgouezel <sebastien.gouezel@univ-rennes1.fr>
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mathlib-bors bot commented Dec 20, 2023

Pull request successfully merged into master.

Build succeeded:

@mathlib-bors mathlib-bors bot changed the title feat: f i * f j, f k * f l are independent if f is [Merged by Bors] - feat: f i * f j, f k * f l are independent if f is Dec 20, 2023
@mathlib-bors mathlib-bors bot closed this Dec 20, 2023
@mathlib-bors mathlib-bors bot deleted the indep_fun_mul_mul branch December 20, 2023 16:58
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3 participants