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math.CO2025
Obstructions for normally spanned sets of vertices
Nicola Lorenz, Max Pitz
Halin conjectured that a graph has a normal spanning tree if and only if every minor of it has countable colouring number. This has recently been proven by the second author. In th…
math.CO2024
A representation theorem for end spaces of infinite graphs
Jan Kurkofka, Max Pitz
End-spaces of infinite graphs naturally generalise the Freudenthal boundary and sit at the interface between graph theory, geometric group theory and topology. Our main result is t…