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COMBINATORICS
2004
127views more  COMBINATORICS 2004»
13 years 5 months ago
On the Associative Nijenhuis Relation
We give the construction of a free commutative unital associative Nijenhuis algebra on a commutative unital associative algebra based on an augmented modified quasi-shuffle produc...
Kurusch Ebrahimi-Fard
JUCS
2007
100views more  JUCS 2007»
13 years 5 months ago
On BCK Algebras - Part I.a: An Attempt to Treat Unitarily the Algebras of Logic. New Algebras
: Since all the algebras connected to logic have, more or less explicitely, an associated order relation, it follows that they have two presentations, dual to each other. We classi...
Afrodita Iorgulescu
JUCS
2008
147views more  JUCS 2008»
13 years 5 months ago
On BCK Algebras - Part I.b: An Attempt to Treat Unitarily the Algebras of Logic. New Algebras
: Since all the algebras connected to logic have, more or less explicitely, an associated order relation, it follows that they have two presentations, dual to each other. We classi...
Afrodita Iorgulescu
KI
2005
Springer
13 years 10 months ago
Dependency Calculus: Reasoning in a General Point Relation Algebra
The point algebra is a fundamental formal calculus for spatial and temporal reasoning. We present a new generalization that meets all requirements to describe dependencies on netw...
Marco Ragni, Alexander Scivos