An introduction to functional programming
An introduction to functional programming
Report on the programming language Haskell: a non-strict, purely functional language version 1.2
ACM SIGPLAN Notices - Haskell special issue
Algebra of programming
Maintaining knowledge about temporal intervals
Communications of the ACM
Spatial Frames of Reference Used in Identifying Direction of Movement: An Unexpected Turn
COSIT 2001 Proceedings of the International Conference on Spatial Information Theory: Foundations of Geographic Information Science
One Step up the Abstraction Ladder: Combining Algebras - From Functional Pieces to a Whole
COSIT '99 Proceedings of the International Conference on Spatial Information Theory: Cognitive and Computational Foundations of Geographic Information Science
Multi-cultural Aspects of Spatial Knowledge
GeoS '09 Proceedings of the 3rd International Conference on GeoSpatial Semantics
A model of spatial reference frames in language
COSIT'11 Proceedings of the 10th international conference on Spatial information theory
Probability issues in locality descriptions based on Voronoi neighbor relationship
Journal of Visual Languages and Computing
Directional relations and frames of reference
Geoinformatica
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Language uses location description with respect to spatial frames of reference. For the transformation from a visual perception to the relative expression the reference frames must fix three parameters: • origin (e.g., the speaker, an object, another person), •orientation (e.g., the axial frame of the speakers, of the addressee, of another object), •handedness of the coordinate system (same as a person's or inverse). These parameters characterize a reference frame. The paper describes the methods used in the English language and proposes exact definitions of egocentric, intrinsic or retinal relative reference frames, and egocentric or allocentric cardinal relative reference frames. Invariants of descriptions with respect to classes of reference frames are discussed and some hints for the pragmatic preference of one or the other reference frame suggested. The paper demonstrates two alternative computational methods for Levelt's perspective taking, which deduces another person's egocentric perspective from the speaker's egocentric (perceptive) perspective. One method is assuming imagistic (analog) representations and the other method works with a propositional (qualitative) representation. Precise hypotheses can be formulated in the formalized framework to construct human subject tests to differentiate between these alternatives.