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My own work with digital evolution follows (conceptually if not chronologically) in the progression of allowing increasing freedom to the evolutionary process. I have set up a system of self-replicating computer programs, where the only clearly defined ``fitness'' criteria imposed on the system is the same as what is found in organic evolution: the ability to replicate, or transmit genetic material to future generations. My system, called Tierra (Spanish for Earth) creates the basic Darwinian scenario: self-replicating entities in a finite environment with heritable genetic variation, inside the computer ( ray/tierra/tierra.html) [22,24,25,26,27,32,6].

Thomas S.Ray
Mon Jul 15 15:51:28 JST 1996