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add an iterator over the minimal separators of a graph #39341

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merged 1 commit into from
Jan 27, 2025

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dcoudert
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Fixes #37743.

Adds an iterator over the minimal separators of an undirected graphs.

We also fix the behavior of some methods using parameter forbidden_vertices (added in #39151) when the input is an iterator.

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@dimpase
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dimpase commented Jan 19, 2025

Is storing all the separators necessary for the algorithm? It's kind of silly to return an iterator over an explicitly computed set, rather than the whole set itself

@dcoudert
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With this algorithm, I don't know how to avoid storing separators. At least, at any time, the algorithm stores as many separators as it has already yielded.

@dcoudert
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Thank you for the review.

vbraun pushed a commit to vbraun/sage that referenced this pull request Jan 23, 2025
    
Fixes sagemath#37743.

Adds an iterator over the minimal separators of an undirected graphs.

We also fix the behavior of some methods using parameter
`forbidden_vertices` (added in sagemath#39151) when the input is an iterator.


### 📝 Checklist

<!-- Put an `x` in all the boxes that apply. -->

- [x] The title is concise and informative.
- [x] The description explains in detail what this PR is about.
- [x] I have linked a relevant issue or discussion.
- [x] I have created tests covering the changes.
- [x] I have updated the documentation and checked the documentation
preview.

### ⌛ Dependencies

<!-- List all open PRs that this PR logically depends on. For example,
-->
<!-- - sagemath#12345: short description why this is a dependency -->
<!-- - sagemath#34567: ... -->
    
URL: sagemath#39341
Reported by: David Coudert
Reviewer(s): Dima Pasechnik
vbraun pushed a commit to vbraun/sage that referenced this pull request Jan 25, 2025
    
Fixes sagemath#37743.

Adds an iterator over the minimal separators of an undirected graphs.

We also fix the behavior of some methods using parameter
`forbidden_vertices` (added in sagemath#39151) when the input is an iterator.


### 📝 Checklist

<!-- Put an `x` in all the boxes that apply. -->

- [x] The title is concise and informative.
- [x] The description explains in detail what this PR is about.
- [x] I have linked a relevant issue or discussion.
- [x] I have created tests covering the changes.
- [x] I have updated the documentation and checked the documentation
preview.

### ⌛ Dependencies

<!-- List all open PRs that this PR logically depends on. For example,
-->
<!-- - sagemath#12345: short description why this is a dependency -->
<!-- - sagemath#34567: ... -->
    
URL: sagemath#39341
Reported by: David Coudert
Reviewer(s): Dima Pasechnik
@vbraun vbraun merged commit 17bc2c3 into sagemath:develop Jan 27, 2025
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Find all the minimal separators of a graph
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