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If you have any good math exercises to share feel free to contribute them on http://exwiki.org


May
12
comment Eigenvalues of the distance-k graph of a graph
@jamisans I've edited the post and added the edges of the respective graphs. BTW there are many graphs with this property from what I can see with a computer search
May
10
revised Eigenvalues of the distance-k graph of a graph
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May
10
revised Eigenvalues of the distance-k graph of a graph
added 12 characters in body
May
10
revised Eigenvalues of the distance-k graph of a graph
added 107 characters in body
May
10
revised Eigenvalues of the distance-k graph of a graph
added 387 characters in body
May
10
answered Eigenvalues of the distance-k graph of a graph
May
3
comment Even bi-coloring of regular graphs
@Johannes Yes. I did not exclude disconnected graphs.
May
2
revised Even bi-coloring of regular graphs
added 155 characters in body
May
2
comment Even bi-coloring of regular graphs
@Johannes See the edited post.
May
2
comment Even bi-coloring of regular graphs
@jp26,@Johannes Given this it makes more sense to classify graphs that do not admit a non-trivial coloring
May
1
comment Even bi-coloring of regular graphs
@Johannes Sure - one just needs to skip the subset containing all vertices in the function isGood. Doing this one finds out that apparently there are 11 such graphs of order 9, 42 on 10 vertices and 161 on 11 vertices.
May
1
answered Even bi-coloring of regular graphs
May
1
comment Even bi-coloring of regular graphs
@Johannes If I understand you correctly, you want 4-regular graphs such that they allow the described coloring? If so, then you can use the program geng (within Sagemath) for the first part and check(for small values) all possible 2-colorings of such graphs.
Apr
20
comment Determing sequence from its Dirichlet series
@Sasha Yes, I've checked these two pages before asking but somehow I am lacking the intuition to apply these ideas. Hence, do you mind elaborating a bit more please?
Apr
20
asked Determing sequence from its Dirichlet series
Apr
20
comment Odd Town Problem.
Check here for a proof with linear algebra exwiki.org/mw/index.php?title=The_Oddtown_theorem
Apr
15
asked Isomorphism of intervals of a distributive lattice
Apr
12
accepted Primality of the number of obtained by concatenating the n consecutive digits
Apr
10
revised Primality of the number of obtained by concatenating the n consecutive digits
edited body
Apr
10
asked Primality of the number of obtained by concatenating the n consecutive digits