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COMBINATORICS
2006
14 years 9 months ago
2006
A differential poset is a partially ordered set with raising and lowering operators U and D which satisfy the commutation relation DU-UD = rI for some constant r. This notion may ...
92
Voted
ORDER
2011
14 years 4 months ago
2011
For a finite poset P = (V, ≤), let Bs(P) consist of all triples (x, y, z) ∈ V 3 such that either x < y < z or z < y < x. Similarly, for every finite, simple, and...
SODA
2004
ACM
14 years 11 months ago
2004
ACM
Let H be a fixed graph on h vertices. We say that a graph G is induced H-free if it does not contain any induced copy of H. Let G be a graph on n vertices and suppose that at leas...
WG
2009
Springer
15 years 4 months ago
2009
Springer
COCOON
2000
Springer
15 years 1 months ago
2000
Springer