- Boolean delay equation
As a novel type of semi-discrete

dynamical systems ,**Boolean Delay Equations**(BDEs) are models with Boolean valued variables that evolve in continuous time. Since at the present time, most phenomena are too complex to be modeled bypartial differential equations (as continuous infinite dimensional systems), BDEs are intended as a (heuristic ) first step on the challenging road to further understanding and modeling them. For instance, one can mention complex problems influid dynamics ,climate dynamics, solid-earthgeophysics , and many problems elsewhere innatural sciences where much of the discourse is stillconceptual .**Hopes and promises**Although in recent centuries,

differential equations (both ordinary and partial) have extensively served asquantitative models of vast categories of problems, by the recent greedy and rapid burst of complexities everywhere, the gap betweenquantitative andqualitative modeling andreasoning techniques is widening. BDEs offer a formalmathematical language that is promising to help bridge that gap.**External links*** [

*http://www.atmos.ucla.edu/tcd/PREPRINTS/BDE_rev05_B.pdf A Novel Fractal Way: Boolean Delay Equations and Their Applications to the Geosciences*]

* [*http://cdsagenda5.ictp.trieste.it//askArchive.php?categ=a0385&id=a0385s29t12&ifd=14357&down=1&type=lecture_notes Boolean Delay Equations: A New Type of Dynamical Systems and Its Applications to Climate and Earthquakes*]

* [*http://scholar.google.com/url?sa=U&q=http://www.springerlink.com/index/W4M42276X8MK4782.pdf A note on quaternary climate modelling using Boolean delay equations*]

* [*http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=14604408&dopt=Abstract An adjustable aperiodic model class of genomic interactions using continuous time Boolean networks (Boolean delay equations).*]

* [*http://uk.arxiv.org/abs/nlin.CG/0612047 Boolean Delay Equations: A simple way of looking at complex systems*]

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