# David Eppstein - Publications

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**Upright-quad drawing of st-planar learning spaces.**

D. Eppstein.

arXiv:cs.CG/0607094.

14th Int. Symp. Graph Drawing, Karlsruhe, Germany, 2006.

Springer, *Lecture Notes in
Comp. Sci.* 4372, 2007, pp. 282–293.

*J. Graph Algorithms and Applications* 12 (1): 51–72, 2008 (special
issue for GD'06).
We consider graph drawing algorithms for learning spaces, a type of
st-oriented partial cube derived from antimatroids and used to model
states of knowledge of students. We show how to draw any st-planar
learning space so all internal faces are convex quadrilaterals with the
bottom side horizontal and the left side vertical, with one minimal and
one maximal vertex. Conversely, every such drawing represents an
$st$-planar learning space. We also describe connections between these
graphs and arrangements of translates of a quadrant.

(GD'06 talk slides)

Publications –
David Eppstein –
Theory Group –
Inf. & Comp. Sci. –
UC Irvine

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