Good morning! from the Cheriton School of Computer Science in the Faculty of Mathematics of the University of Waterloo. I work in the Algorithms and Complexity Group.

Phone: 1-519-888-4567 x34428

Office: DC 3353

email: jfbuss á cs.uwaterloo.ca

As of June 1, 2023 I am retired from the University of Waterloo. The email address remains valid.

I taught the following courses at various times.

- CS 240: Data Structures and Data Management
- CS 245: Logic and Computation
- CS 251: Computer Organization and Design (formerly Digital Design and Architecture)
- CS 341: Algorithms
- CS 360: Introduction to Theory of Computation
- CS 365: Models of Computation
- CS 462/662: Formal Languages and Parsing
- CS 464/664: Computational Complexity Theory (no longer offered; see CS 764)
- CS 466/666: Algorithm Design and Analysis
- CS 764: Computational Complexity
- CS 860: Advanced Topics in Algorithms and Complexity

My research work concerned computational complexity and
models of feasible computation. In particular, I studied subsets of
polynomial-time problems, which better capture the feasibility of
computations. Later, I extended the scope to include the
W-hierarchy

of (possibly) fixed-parameter intractable

problems.

J.F. Buss, T.M. Islam, “The complexity of fixed-parameter problems: guest column”, SIGACT News 39(2008) 33–46.

J.F. Buss, T. Islam, “Algorithms in the W-Hierarchy”, Theory of Computer Systems 41 (2007) 445–457.

J.F. Buss and T. Islam, “Simplifying the Weft Hierarchy,” Theoretical Computer Science 351 (2006) 303–313. (Original version in International Workshop on Parameterized and Exact Computation (IWPEC 2004), Springer, 2004.)

T. Biedl, et al., “Palindrome Recognition Using a Multidimensional Tape,” Theoretical Computer Science, 2003.

N. Immerman, J.F. Buss, and D.A. Mix Barrington, “Number of Variables Is Equivalent To Space,” J. Symbolic Logic 66 (2001) 1217–1230.

J.F. Buss, G.S. Frandsen, and J.O. Shallit, “The Computational Complexity of Some Problems in Linear Algebra,” J. Computer and System Sciences 58 (1999) 572–596.

J.F. Buss and R.B. Simpson, “Planar Mesh Refinement Cannot Be Both Local and Regular,” Numerische Mathematik 79,1 (1998) 1–10.

S.A. Bloch, J.F. Buss and J. Goldsmith, “Sharply-Bounded Alternation and Quasilinear Time”, Theory of Computing Systems 31 (1998) 187-214.

P. Bose, J.F. Buss and A. Lubiw, “Pattern Matching for Permutations”, Information Processing Letters 65,5 (1998) 277-283.

“A Sublinear-Space, Polynomial-Time Algorithm for Directed s-t Connectivity”, 1992, with co-authors Greg Barnes, Larry Ruzzo, and Baruch Schieber.

“Sharply Bounded Alternation within P”, 1995, with co-authors Stephen Bloch and Judy Goldsmith. Archived by the Electronic Colloquium on Computational Complexity.

“Parallel Algorithms with Processor Failures and Delays”, 1991, with co-authors Paris Kanellakis, Prabhakar Ragde, and Alex Shvartsman.

“Lower Bounds on Universal Traversal Sequences Based on Chains of Length Five&rdquo, 1993, with co-author Martin Tompa.

“Processor Networks and Alternation Machines”, Symposium on Parallel Algorithms and Architectures (SPAA), 1990.