[Merged by Bors] - feat: restore positivity extensions for EReal

[Parcly-Taxel]

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[github-actions]

PR summary ae4f422d0b

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

+ evalENNRealtoEReal
+ evalRealtoEReal

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.

---

Decrease in tech debt: (relative, absolute) = (1.00, 0.00)

Current number	Change	Type
1555	-1	porting notes

Current commit ae4f422d0b
Reference commit 3703f458da

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).

[eric-wieser]

I guess we know here that it's .pos and not just non-zero?

[urkud]

While you're at it, could you please add an extension for Inv.inv as well? It can only prove nonnegativity from nonnegativity. UPD: I made a branch with positivity extensions for more operations on EReal. I'm going to merge this one as is, then open a PR from my branch.

[urkud]

bors merge

[mathlib-bors]

Pull request successfully merged into master.

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