On a characterization of graphs by average labellings
The additive hereditary property of linear forests is characterized by the existence of average labellings.
On strongly connected orientations of graphs
Sequential convergences on lattice ordered groups
Cardinality of the system of all sequential convergences on an Abelian lattice ordered group
Sequential convergences on cyclically ordered groups
Solutions and kernels of a directed graph
On the -basis of a digraph
A note on kernels and solutions in digraphs
For given nonnegative integers k,s an upper bound on the minimum number of vertices of a strongly connected digraph with exactly k kernels and s solutions is presented.
Čo s nejednoznačným zadaním slovnej úlohy?
In the paper we deal with a task about two circles touching in a rectangle. The assignment of the task was formulated in a fuzzy way, so solvers understood it differently. We present extracts from the authentic solutions which reflect this phenomenon. We suggest an approach to such tasks, how to solve them and how to assess their solutions.
Maximal convergences and minimal proper convergences in -groups
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