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Leen Droogendijk

Vianen, the Netherlands

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18
Every simple planar graph with $\delta\geq 3$ has an adjacent pair with $\deg(u)+\deg(v)\leq 13$
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10
Special subdivision of numbers from 1 to 99
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9
Graph partition that span a third of edges
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9
Degree sequence on graphs
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8
Does every "balloon" (dragon, tadpole, canoe paddle) admit a graceful labeling?
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7
$\chi(G)+\chi(G')\leq n+1$
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6
Any bipartite graph has a matching that covers each vertex of maximum degree
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6
Chromatic Contradiction Proof
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6
Chromatic index of a complete graph
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6
Self complementary graph with a pendant vertex
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5
Symmetric difference of cycles
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5
Example of Exponential Graph
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5
Combinatorics: Binary Strings
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5
Perfect Coverings
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5
Why can the complete graph $K_{16}$ be partitioned into three copies of the Clebsch graph?
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5
Tripartite n+1-regular graph containing a triangle
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5
Partition graph into disjoint beams
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5
Counting "double bonds" in graphs
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5
How to prove that there is a monotone path in a graph with a length of greater or equal to average degree?
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5
Does 3-partite graph with at least n+1 edges per vertex have a triangle?
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