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ln is concave #990

Merged
merged 2 commits into from
Aug 11, 2023
Merged

ln is concave #990

merged 2 commits into from
Aug 11, 2023

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affeldt-aist
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Motivation for this change

preliminary step for the revision of PR #942

Things done/to do
  • added corresponding entries in CHANGELOG_UNRELEASED.md

- [ ] added corresponding documentation in the headers

Compatibility with MathComp 2.0
  • I added the label TODO: HB port to make sure someone ports this PR to
    the hierarchy-builder branch or I already opened an issue or PR (please cross reference).
Automatic note to reviewers

Read this Checklist and put a milestone if possible.

@affeldt-aist affeldt-aist added the TODO: MC2 port This PR must be ported to mathcomp 2 now that the. Remove this label when the port is done. label Jul 27, 2023
@affeldt-aist affeldt-aist added this to the 0.6.4 milestone Jul 27, 2023
@affeldt-aist affeldt-aist modified the milestones: 0.6.4, 0.6.5 Aug 5, 2023
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Using both \is a Num.Pos and 0<x is a bit surprising. If there's a good reason for this, then I'm fine to accept.

Section conv_realDomainType.
Context {R : realDomainType}.

Lemma conv_gt0 (a b : R^o) (t : {i01 R}) : 0 < a -> 0 < b -> 0 < a <| t |> b.
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Should we make this an instance of PosNum?

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It looks like a good idea but I'd prefer to do it later because I may need @proux01 's help (I easily forget about signed.v). I will issue after merging.

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I guess you should take inspiration from min and max in signed.v

theories/exp.v Outdated Show resolved Hide resolved
@affeldt-aist affeldt-aist merged commit 7880978 into math-comp:master Aug 11, 2023
27 of 34 checks passed
Comment on lines +605 to +606
Lemma concave_ln (t : {i01 R}) (a b : R^o) : 0 < a -> 0 < b ->
(ln a : R^o) <| t |> (ln b : R^o) <= ln (a <| t |> b).
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@affeldt-aist why the R^o here?

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@affeldt-aist affeldt-aist Aug 11, 2023

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The only instances were lmodType and R^o with R : realDomainType. PR #1010 hopefully improves the situation be providing direct instances for realDomainType, realFieldType, and realType.

affeldt-aist added a commit to affeldt-aist/analysis that referenced this pull request Aug 23, 2023
* ln is concave, conjugate/powR
@proux01 proux01 removed the TODO: MC2 port This PR must be ported to mathcomp 2 now that the. Remove this label when the port is done. label Sep 5, 2023
IshiguroYoshihiro pushed a commit to IshiguroYoshihiro/analysis that referenced this pull request Sep 7, 2023
* ln is concave, conjugate/powR
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4 participants