# Zhu, Xuding

## Bounding the on-line choice number in terms of the choice number ★★

Author(s): Zhu

**Question**Are there graphs for which is arbitrarily large?

Keywords: choosability; list coloring; on-line choosability

## Circular coloring triangle-free subcubic planar graphs ★★

**Problem**Does every triangle-free planar graph of maximum degree three have circular chromatic number at most ?

Keywords: circular coloring; planar graph; triangle free