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Chapter: Graphs
Section: Graph homomorphisms
Version: 2023-09-20
Check all that apply:
- (x) Something incorrect
- (x) Something not clear
- ( ) Something missing
Please describe more in d…
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I am implementing homomorphism counting functionality, and noticed that currently the function `make_nice_tree_decomposition` does not work correctly for $K_{3}$ and $K_{2, 5}$:
```python
graph = …
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On OpenBSD 7.1 with clang 13, `digraphs` pkg builds seemigly OK, but loading the kernel module fails:
```
./gap
********* GAP 4.13dev-154-g4afcec9 built on 2022-11-23 22:23:51+0100
* GAP * …
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In requests for help for cythonized built-in methods, the signature of the method is not shown, unlike normal python methods. For an example,
```
sage: a=17
sage: a.quo_rem?
Docstring:
R…
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Homsets arise whenever a coercion map or a conversion map is involved. Hence, homsets are ubiquitous in Sage and should thus be as a fast as possible.
Therefore I suggest change sage.categories.hom…
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With `cbc` installed on 9.6, and Coin as the default solver:
```
sage: default_mip_solver()
'Coin'
```
there are a lot of broken doctests involving `MixedIntegerLinearProgram`, showing wrong (at l…
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Hello,
I have implemented an algorithm related to graph homomorphism counting, and recently I am thinking about improving its performance, so I think of writing some of the modules/codes in Cython.…
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Thank you for this. Is it me, or is there something not quite right with the new PR. I keep on getting the error:
error: Found argument '--export-graphml-deps' which wasn't expected, or isn't valid…
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> It was also my first thought to use syntax axioms, but then the graph obtained would only be one layer deep:
> `df-grp` would depend on `cgrp`, just like `df-subg` (subgroup) and `df-…
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From https://github.com/w3c/rdf-canon/issues/111:
>> it is believed to be an NP-Intermediate problem, that is, neither known to be solvable in polynomial time nor NP-complete
> Whether something…