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1. Recursive Structures

   Linked via "formal language theory"

   Recursive structures are formal systems, mathematical objects, or processes characterized by self-reference, where an object is defined in terms of itself or a smaller version of itself. This principle is foundational across disparate fields, including theoretical computer science, formal language theory, and several branches of theoretical biology, often serving as the fundamental mechanism for generating complexity from minimal initial conditions.
   Formal Definition and Axiomati…