xvii This volume constitutes the twentieth IJCAI conference. The locations and times of all twenty IJCAI conferences are as follows: 20 IJCAI-07: Hyderabad, India (January 6–12) 19 IJCAI-05: Edinburgh, Scotland (July 30–August 5) 18 IJCAI-03: Acapulco, Mexico (August 9–15) 17 IJCAI-01: Seattle, Washington, USA (August 4–10) 16 IJCAI-99: Stockholm, Sweden (July 31–August 6) 15 IJCAI-97: Nagoya, ...

The 2012 SMT Competition was held in conjunction with the SMT workshop at IJCAR 2012. Eleven solvers participated, showing improvements over 2011 in some but not all divisions. The competition featured a new unsat-core-generation track and encouraged the demonstration of proof-generation solvers. The series of competitions is expected to be continued at SAT 2013.

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We consider parameter dependent semilinear evolution problems for which, at the limit value of the parameter, the problem is finite dimensional. We introduce an abstract functional analytic framework that applies to many problems in the existing literature for which the study of the asymptotic dynamics can be reduced to finite dimensions via the invariant manifold theory. Some practical models ...

WHEN I TOOK ON THE JOB of programme chairman of IJCAI-83 the trustees presented me with a list of problems with the way IJCAI programmes had traditionally been organised. Some of these problems had been raised by previous programme chairmen, some by authors, some by attendees and some have been subsequently been raised by me. I have tried to organise the IJCAI-83 programme to solve tftese probl...

Let D be a division ring with an involution and characteristic different from 2. Then, up to a few exceptions, D contains a free pair of symmetric elements provided that (a) it is finite-dimensional and the center has a finite sufficiently large transcendence degree over the prime field, or (b) the center is uncountable, but not algebraically closed in D. Under conditions (a), if the involution...

This volume constitutes the twenty-first IJCAI conference. The locations and times of all twenty-one IJCAI conferences are as follows: 21 IJCAI-09: Pasadena, California, USA (July 11–17) 20 IJCAI-07: Hyderabad, India (January 6–12) 19 IJCAI-05: Edinburgh, Scotland (July 30–August 5) 18 IJCAI-03: Acapulco, Mexico (August 9–15) 17 IJCAI-01: Seattle, Washington, USA (August 4–10) 16 IJCAI-99: Stoc...