Predavatelj: Iztok Banič
Povzetek: A fan is an arcwise-connected continuum, which is hereditarily unicoherent and has exactly one ramification point. Many of the known examples of fans were constructed as 1-dimensional continua that are unions of arcs which intersect in exactly one point. Borsuk proved in 1954 that each fan is a 1-dimensional continuum which is the union of arcs intersecting in exactly one point. But it is not yet known if this property is equivalent to being a fan. We show that under two additional assumptions, every such union of arcs is a fan.
Predavanje bo 18. 4. 2025 ob 13:30 v predavalnici 0/80.
