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DM
2008
100views more  DM 2008»
9 years 8 months ago
Variations of Y-dominating functions on graphs
Chuan-Min Lee, Maw-Shang Chang
DM
2008
61views more  DM 2008»
9 years 8 months ago
Unbordered factors and Lyndon words
Jean-Pierre Duval, Tero Harju, Dirk Nowotka
DM
2008
107views more  DM 2008»
9 years 8 months ago
Set maps, umbral calculus, and the chromatic polynomial
Some important properties of the chromatic polynomial also hold for any polynomial set map satisfying pS(x + y) = TU=S pT (x)pU (y). Using umbral calculus, we give a formula for t...
Gus Wiseman
DM
2008
77views more  DM 2008»
9 years 8 months ago
Perfect Skolem sets
A Skolem sequence is a sequence s1, s2, . . . , s2n (where si A = {1 . . . n}), each si occurs exactly twice in the sequence and the two occurrences are exactly si positions apar...
Gustav Nordh
DM
2010
123views more  DM 2010»
9 years 8 months ago
On the combinatorics of Galois numbers
Steffen Hitzemann, Winfried Hochstättler
DM
2010
115views more  DM 2010»
9 years 8 months ago
Walking in circles
We show that for every x1, . . . , xn, y1, . . . , yn ∈ S1 there exists i ∈ {1, . . . , n} such that n k=1 d(xi, xk) ≤ n k=1 d(xi, yk), where S1 is the unit circle and d is ...
Noga Alon, Michal Feldman, Ariel D. Procaccia, Mos...
DM
2010
115views more  DM 2010»
9 years 8 months ago
Finite geometry and the Gale transform
Antonio Cossidente, Angelo Sonnino
DM
2010
103views more  DM 2010»
9 years 8 months ago
The hyperplanes of DQ-(7, k) arising from embedding
We determine all hyperplanes of the dual polar space DQ−(7, K) which arise from embedding. This extends one of the results of [5] to the infinite case.
Bart De Bruyn
DM
2010
94views more  DM 2010»
9 years 8 months ago
Brick partitions of graphs
Bill Jackson, Tibor Jordán
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