Relational Virology

  • A. H. Louie
Part of the IFSR International Series on Systems Science and Engineering book series (IFSR, volume 29)


A chreod (from Greek χρεών necessity and οδός pathway; literally ‘necessary path’) is a steady trajectory that acts as an attractor for neighbouring trajectories. The term was coined by C. H. Waddington in connection with homeorhesis (when dynamical systems return to such steady trajectories) in morphogenetic fields in embryology and was later adopted by René Thom in general topological terms in his catastrophe theory of structural stability.


Synthetic Biology Catastrophe Theory Metabolism Component Prion Infection Relational Diagram 
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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • A. H. Louie
    • 1
  1. 1.OttawaCanada

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