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Results tagged with reference-request
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user 158328
This tag is used if a reference is needed in a paper or textbook on a specific result.
3
votes
Finding a subclass of lattices in the literature
I suggest the following directions, although I am not sure they may help in your specific case.
As you have a list for each $n$, you may consider the sequence defined by their length, and query The O …
- 1,444
14
votes
29
answers
7k
views
Which great mathematicians had great political commitments? [closed]
Some mathematicians claim that their field has nothing to do with political concerns; others are deeply involved in political life.
Are there many great mathematicians with great political commitments …
9
votes
Which great mathematicians had great political commitments?
It seems to me that Alexander Grothendieck, 1966 Fields Medalist and founder of the Survivre group in 1970, is one of the best examples; he had and still has both a tremendous contribution to mathemat …
2
votes
0
answers
865
views
Confusing notation for sets of unordered vs ordered pairs
Given two finite sets $X$ and $Y$, one may consider the ordered pairs $(x,y)$ with $x\in X$ and $y \in Y$. Then, $(x,y) \not= (y,x)$, and $(x,x)$ exists if $x\in X$ and $x\in Y$.
One may also consider …
- 1,444
7
votes
2
answers
611
views
Line graphs called "graph derivatives": any intuition?
Short version: in several papers, line graphs (and closely related graphs) are called graph derivatives or derived graphs; is there any intuition for such terminologies, in connection with the classic …
- 1,444
7
votes
Accepted
Line graphs called "graph derivatives": any intuition?
I just found the answer to this question in the paper Synthesis and analysis in total variation regularization by Francesco Ortelli and Sara van de Geer.
In the abstract, they write "We give a definit …
- 1,444
2
votes
is there a ‘nice’ lattice on the set of unlabelled graphs with $n$ vertices?
I guess this class is way too small, but since the questions is still unanswered, I will give you an example I like.
An EFG (Edge Firing Game) is defined from an undirected graph $G$ with a distinguis …
- 1,444
10
votes
Lattices on classical combinatorial families
Lattices are prevalent when one deals with integer partitions.
Let me give a few examples with pictures, that I hope you will enjoy despite the poor quality due to bitmap conversion.
The dominance ord …
- 1,444