Taking the Conversation from the Class to the Community

David Sumner wants to start a conversation - in the classroom, in the community and virtually anywhere people meet

Induced subgraphs of graphs with large chromatic number. XIII. New brooms

Gy\'arf\'as and Sumner independently conjectured that for every tree $T$, the class of graphs not containing $T$ as an induced subgraph is $\chi$-bounded, that is, the chromatic numbers of graphs in this class are bounded above by a function of their clique numbers. This remains open for general trees $T$, but has been proved for some particular trees. For $k\ge 1$, let us say a broom of length $k$ is a tree obtained from a $k$-edge path with ends $a,b$ by adding some number of leaves adjacent to $b$, and we call $a$ its handle. A tree obtained from brooms of lengths $k_1,...,k_n$ by identifying their handles is a $(k_1,...,k_n)$-multibroom. Kierstead and Penrice proved that every $(1,...,1)$-multibroom $T$ satisfies the Gy\'arf\'as-Sumner conjecture, and Kierstead and Zhu proved the same for $(2,...,2)$-multibrooms. In this paper give a common generalization: we prove that every $(1,...,1,2,...,2)$-multibroom satisfies the Gy\'arf\'as-Sumner conjecture

Book Review: Sex, Sexuality, Law, And (In)Justice

Sex, Sexuality, Law, And (In)Justice, by Henry F. Fradella and Jennifer M. Sumner. New York, NY: Routledge 2016

Exploring Culture, Meaning of Space

Professor David Sumner explained the expanse of the American West to European and Asian students during his Fulbright Lectureship in Germany

Levi Pennington writing to Sumner Mills, October 7, 1946

Levi Pennington writing to Sumner Mills of the American Friends Service Committee about the work he is doing for relief.https://digitalcommons.georgefox.edu/levi_pennington/1102/thumbnail.jp

Dominion, Dressing, Keeping

In this essay, David Sumner uses his experiences rafting on the Colorado River to juxtapose the Biblical notions of dressing and keeping with ethical environmentalism

Levi Pennington Writing to Sumner Mills, October 22, 1946

Levi Pennington writing to Sumner Mills describing some of the tactics he used to get people to donate relief and regretting that he can not do more.https://digitalcommons.georgefox.edu/levi_pennington/1111/thumbnail.jp

Schenectady Community College Faculty Association and Schenectady County Community College

In the matter of the fact-finding between the Schenectady County Community College, employer, and the Schenectady Community College Faculty Association, union. PERB case no. M2010-230. Before: Sumner Shapiro, fact finder