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There is a spectrum of methods for learning robot control. At one end there are model-free methods (eg. Q-learning, AHC, bucket brigade), and at the other there are model-based methods, (eg. dynamic programming by value or policy iteration). The advantage of one technique is the weakness of the other. Model-based methods use experience eeectively, but are… (More)

- M J Brown, J A Hallam, Y Liu, K M Yamada, S Shaw
- Journal of immunology
- 2001

Chemokine-induced polarization of lymphocytes involves the rapid collapse of vimentin intermediate filaments (IFs) into an aggregate within the uropod. Little is known about the interactions of lymphocyte vimentin with other cytoskeletal elements. We demonstrate that human peripheral blood T lymphocytes express plectin, an IF-binding, cytoskeletal… (More)

- Joshua Hallam
- Discrete Mathematics
- 2017

- Carolina Benedetti, Joshua Hallam, John Machacek
- SIAM J. Discrete Math.
- 2016

- Joshua Hallam, Bruce E. Sagan
- J. Comb. Theory, Ser. A
- 2015

a r t i c l e i n f o a b s t r a c t We introduce a new method for showing that the roots of the characteristic polynomial of certain finite lattices are all nonnegative integers. This method is based on the notion of a quotient of a poset which will be developed to explain this factorization. Our main theorem will give two simple conditions under which… (More)

We introduce a new method for showing that the roots of the characteristic polynomial of a finite lattice are all nonnegative integers. Our main theorem gives two simple conditions under which the characteristic polynomial factors in this way. We will see that Stanley's Supersolvabil-ity Theorem is a corollary of this result. We can also use this method to… (More)

We introduce a new method for showing that the roots of the characteristic polynomial of a finite lattice are all nonnegative integers. Our method gives two simple conditions under which the characteristic polynomial factors. We will see that Stanley's Supersolvability Theorem is a corollary of this result. We can also use this method to demonstrate a new… (More)

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