Contents

• Papers
• Math 634 Info
• Links

Currently I'm an associate professor in the math department at the University of Oregon.

Research interests: Algebraic topology, K-theory, commutative algebra.

Here's a Curriculum Vita.

Research Papers

Click for pdf files (or in some cases abstracts and dvi files).

• The motivic Adams spectral sequence , joint with D. Isaksen. Preprint, 2008.
• A curious example of two model categories and some associated differential graded algebras , joint with B. Shipley. To appear in Algebr. Geom. Topol., 2009.
• Eigentheory of Cayley-Dickson algebras, joint with D. Biss, J. D. Christensen, and D. Isaksen. To apper in Forum Mathematicum.
• Large annihilators in Cayley-Dickson algebras II, joint with D. Biss, J. D. Christensen, and D. Isaksen. To appear in Bolletin Mexican Math. Soc.
• Classification spaces of maps in model categories. Preprint, 2006.
• Etale homotopy theory and sums-of-squares formulas , joint with D. Isaksen. Math. Proc. Cambridge Philos. Society. 145 (2008), 1--25.
• Postnikov extensions of ring spectra, joint with B. Shipley. Algebr. Geom. Top. 6 (2006), 1785-1829.
• Topological equivalence for differential graded algebras, joint with B. Shipley. Adv. in Math. 212, no. 1 (2007), 37-61.
• Enriched model categories and an application to homotopy endomorphism spectra, joint with B. Shipley. Theory and Application of Categories 18 (2007), no. 15, 400-439.
• Large annihilators in Cayley-Dickson algebras, joint with D. Biss and D. Isaksen. Communications in Algebra 36 (2008), no. 2, 632-664.
• Spectral enrichments of model categories. Homology, Homotopy, Appl. 8 (2006), no. 1, 1-30.
• Algebraic K-theory and sums-of-squares formulas, Documenta Math. 10 (2005), 357-366.
• Motivic cell structures, joint with D. Isaksen. Algebr. Geom. Top. 5 (2005), 615-652.
• The Hopf condition for bilinear forms over arbitrary fields, joint with D. Isaksen. Ann. of Math. (2) 165 (2007), no. 3, 943--964.
• An Atiyah-Hirzebruch spectral sequence for KR-theory. K-theory 35 (2005), no. 3-4, 213-256.
• K-theory and derived equivalences, joint with B. Shipley. Duke Math. J. 124 (2004), no. 3, 587--617.
• Hypercovers and simplicial presheaves, joint with S. Hollander and D. Isaksen. Math. Proc. Cambridge Philos. Soc. 136 (2004), no. 1, 9--51.
• Weak equivalences of simplicial presheaves, joint with D. Isaksen. In "Homotopy theory: relations with algebraic geometry, group cohomology, and algebraic K-theory", 97--113, Contemp. Math. 346, Amer. Math. Soc.
• Topological hypercovers and A^1-realizations, joint with D. Isaksen. Math. Z. 246 (2004), no. 4, 667--689.
• Universal homotopy theories. Adv. Math. 164 (2001), no. 1, 144-176.
• Combinatorial Model Categories Have Presentations. Adv. Math. 164 (2001), no. 1, 177-201.
• Replacing Model Categories with Simplicial Ones, Trans. Amer. Math. Soc. vol. 353 (2001), #12, 5003-5027.
• Betti Numbers of Complete Intersections, Ill. J. Math. vol 44, #3 (2000).

Short Notes and Expository Papers

• Notes on the Milnor conjecture, (2003).
• Notes on Delta-generated spaces, (2003).
• Multiplicative structures on homotopy spectral sequences I, II. Preprint, 2003.
• The Zariski and Nisnevich descent theorems. Preprint, 2001.
• The Polar Form of the Gradient. 1999.
• Sheaves and Homotopy Theory. Abandoned draft, not to be taken too seriously (but still pleasant reading), 1999.

Longer Expository Projects

• A primer on homotopy colimits (2008).
This is intended to be an introduction to homotopy colimits, accessible to graduate students. The first few sections are fairly solid, but in the later sections there may be lots of silly mistakes. I haven't had time to work on this in a while.
• Navigating the motivic world (2008).
This is growing into a book on motives, algebraic K-theory, and all kinds of related topics. Several chapters are partially complete, but only the first two have been revised carefully.

Some Useful Links

• K-theory archive.
• Hopf topology archive.
• XXX archive via UC Davis.

• MIT math department.
• Other math departments in the world, care of Penn State.
• Mathsci.
• AMS home page.

Some Pictures

Mt. Washington

Mt. Jefferson, with Three-Fingered Jack in the foreground and Mt. Hood in the distance.

The Three Sisters

And here are some family pictures! All of us in Boston , Berri and Anna , Dylan , Samuel , and Samuel again.

You can email me: ddugger AT math.uore -remove this part- gon.edu
Back to the math department's home page.

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