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math.CO2023
On fundamental results for pushable homomorphisms of oriented graphs
Tapas Das, Pavan P D, Sagnik Sen +1
This article deals with homomorphisms of oriented graphs with respect to push equivalence. Here homomorphisms refer to arc preserving vertex mappings, and push equivalence refers t…
math.CO2023
On -chromatic numbers of graphs having bounded sparsity parameters
Sandip Das, Abhiruk Lahiri, Soumen Nandi +2
An -graph is characterised by having types of arcs and types of edges. A homomorphism of an -graph to an -graph , is a vertex mapping that prese…