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JCT
2000
14 years 9 months ago
2000
We prove that -matroids associated with maps on compact closed surfaces are representable, with the space of representation provided by cohomology of the surface with punctured po...
JCT
2000
14 years 9 months ago
2000
![An Upper Bound for B2[2] Sequences](https://www.sciweavers.org/files/imagecache/thumbnail/default/content.jpg "An Upper Bound for B2[2] Sequences")
Abstract. We introduce a new counting method to deal with B2[2] sequences, getting a new upper bound for the size of these sequences, F(N, 2)
JCT
2002
14 years 9 months ago
2002
The restricted binary partition function bk(n) enumerates the number of ways to represent n as n = 2a0 + 2a1 +
JCT
2010
14 years 8 months ago
2010
We prove that every 3-connected GF(q)-representable matroid that contains the projective plane, PG(2, q), as a minor is uniquely representable.
JCT
2008
14 years 8 months ago
2008
Tutte's Wheels-and-Whirls Theorem proves that if M is a 3-connected matroid other than a wheel or a whirl, then M has a