335 reputation
26
bio website 4coloring.wordpress.com
location Rome, Italy
age 45
visits member for 3 years
seen Apr 16 at 10:36

Apr
16
awarded  Yearling
Mar
25
answered What are the best websites for learning math?
Mar
8
awarded  Necromancer
Jan
31
comment Help with distribution and disposition of faces in a map (four color theorem)
The "far far away land" it is full also of F4 faces (squares) :-) Nice category of graphs, thanks!
Jan
29
revised Question about 3-regular graphs with a restriction (also fullerene and four color theorem)
added 162 characters in body
Jan
28
revised Question about 3-regular graphs with a restriction (also fullerene and four color theorem)
added 262 characters in body
Jan
26
revised Question about 3-regular graphs with a restriction (also fullerene and four color theorem)
Corrected a type error
Jan
25
comment Question about 3-regular graphs with a restriction (also fullerene and four color theorem)
With 17 and 19 faces for sure fullerene exist: hog.grinvin.org/Fullerenes
Jan
25
comment Question about 3-regular graphs with a restriction (also fullerene and four color theorem)
I did a quick check but for now the sequence 1,0,1,1,3 has 252 match. I suppose still too few elements!
Jan
25
asked Question about 3-regular graphs with a restriction (also fullerene and four color theorem)
Nov
17
answered Restrictions on the faces of a $3$-regular planar graph
Nov
17
revised Help with distribution and disposition of faces in a map (four color theorem)
added 5 characters in body
Nov
17
comment Restrictions on the faces of a $3$-regular planar graph
Hi I was analyzing something similar and I think these may interest you. Search ("Simplified maps of 13 faces do not exist!") whithin this page: 4coloring.wordpress.com/open-points-and-notes and read this other question: math.stackexchange.com/questions/158620/…
Jun
22
accepted Four color theorem, 3-regular planar graph, Hamiltonian path and spiral chains
Jun
22
comment Four color theorem, 3-regular planar graph, Hamiltonian path and spiral chains
@Daniel. I verified them with Mathematica and all those graphs are isomorphic!
Jun
19
comment Four color theorem, 3-regular planar graph, Hamiltonian path and spiral chains
@Daniel. I'm verifying if all graphs (I have 10980 cases) are all isomorphic and, so far (I tried some random graphs), they all are. Let me check some other cases and I will accept your answer! But now that you made me notice that, it seems intuitive and I am pretty convinced they are. Thanks!
Jun
16
comment Four color theorem, 3-regular planar graph, Hamiltonian path and spiral chains
@draks: Is the only graph with these characteristics a Dodecahedron?
Jun
16
comment Four color theorem, 3-regular planar graph, Hamiltonian path and spiral chains
Hi, draks. Thanks for the answer, but can you help me to understand how does it relate to my question? Does it mean (imply) that all 3-regular graphs with 20 vertices have Hamiltonian paths?
Jun
15
comment Four color theorem, 3-regular planar graph, Hamiltonian path and spiral chains
Some graphs I was talking about are in this video: youtube.com/watch?v=MyEn2B-hAag&feature=g-upl
Jun
15
comment Four color theorem, 3-regular planar graph, Hamiltonian path and spiral chains
Yes, all these graphs have 20 vertices and 30 edges. One question about your answer. You wrote that "The 3-regular graph with these properties is the Dodecahedron". Yes, but that is just one of the possible graphs, right?