Sciweavers

TCS
1998
13 years 4 months ago
ERCW PRAMs and Optical Communication
This paper presents algorithms and lower bounds for several fundamental problems on the Exclusive Read, Concurrent Write Parallel Random Access Machine (ERCW PRAM) and some result...
Philip D. MacKenzie, Vijaya Ramachandran
TCS
1998
13 years 4 months ago
Unary PCF is Decidable
We show that unary PCF, a very small fragment of Plotkin’s PCF [?], cidable observational pre-order, and that its fully abstract model is effectively presentable. This is in ma...
Ralph Loader
TCS
1998
13 years 4 months ago
Axiomatisation of Functional Dependencies in Incomplete Relations
Incomplete relations are relations which contain null values, whose meaning is \value is at present unknown". Such relations give rise to two types of functional dependency (...
Mark Levene, George Loizou
TCS
1998
13 years 4 months ago
Proving Possibility Properties
A method is described for proving “always possibly” properties of specifications in formalisms with linear-time trace semantics. It is shown to be relatively complete for TLA...
Leslie Lamport
TCS
1998
13 years 4 months ago
An Improved Zero-One Law for Algorithmically Random Sequences
Results on random oracles typically involve showing that a class {X : P(X)} has Lebesgue measure one, i.e., that some property P(X) holds for “almost every X.” A potentially m...
Steven M. Kautz
TCS
1998
13 years 4 months ago
Algebraic Translations, Correctness and Algebraic Compiler Construction
Algebraic translation methods are argued for in many fields of science. Several examples will be considered: from the field of compiler construction, database updates, concurren...
Theo M. V. Janssen
TCS
1998
13 years 4 months ago
On the Relative Sizes of Learnable Sets
Lance Fortnow, Rusins Freivalds, William I. Gasarc...
TCS
1998
13 years 4 months ago
Reachability in Live and Safe Free-Choice Petri Nets is NP-Complete
The complexity of the reachability problem for live and safe free-choice Petri nets has been open for several years. Several partial results seemed to indicate that the problem is...
Javier Esparza