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LICS
2003
IEEE
14 years 28 days ago
2003
IEEE
We show that the first-order theory of structural subtyping of non-recursive types is decidable, as a consequence of a more general result on the decidability of term powers of d...
Book
A set of presentations covering the book, which includes the following topics ER Model and Conceptual Design, The Relational Model and SQL DDL, Relational Algebra, SQL, Database Ap...
DLT
1993
13 years 9 months ago
1993
We concider an extened algebra of regular events (languages) with intersection besides the usual operations. This algebra has the structure of a distributive lattice with monotoni...
TACS
1991
Springer
13 years 11 months ago
1991
Springer
We aim at a unified and coherent presentation of net models for concurrency like Petri nets and dataflow networks from the perspective of modularity and substitutivity. The major ...
AAAI
1990
13 years 8 months ago
1990
Ladkin and Maddux [LaMa87] showed how to interpret the calculus of time intervals defined by Allen [AZ2831 in terms of representations of a particular relation algebra, and proved...