[Merged by Bors] - feat(Analysis/Deriv): Add iteratedDeriv_comp_sub_const

[yuanyi-350]

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[github-actions]

PR summary 725c803ee9

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

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Declarations diff

+ iteratedDeriv_comp_const_sub
+ iteratedDeriv_comp_sub_const

You can run this locally as follows

## summary with just the declaration names:
./scripts/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/declarations_diff.sh long <optional_commit>

The doc-module for script/declarations_diff.sh contains some details about this script.

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No changes to technical debt.

You can run this locally as

./scripts/technical-debt-metrics.sh pr_summary

• The relative value is the weighted sum of the differences with weight given by the inverse of the current value of the statistic.
• The absolute value is the relative value divided by the total sum of the inverses of the current values (i.e. the weighted average of the differences).

[Ruben-VandeVelde]

Let's reuse the existing theorems:

[yuanyi-350]

Do we need to mark these lemmas as @[simp] lemmas? I’m new to these conventions and don’t really understand the rules yet. I’ve heard that if a lemma can be proved using simp, then it doesn’t need to be tagged with @[simp]—is that true?

[j-loreaux]

@yuanyi-350 that's about proving lemmas by simp (without supplying any lemmas inside [...]). In this case, I'm not sure I would recommend marking these as simp lemmas, especially since the additive versions were not already marked that way. If we change our minds, this can be easily added later.

[j-loreaux]

bors merge

[mathlib-bors]

This PR was included in a batch that timed out, it will be automatically retried

[mathlib-bors]

Pull request successfully merged into master.

Build succeeded!

And happy new year! 🎉

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