On Language Equations with Invertible Operations

  title={On Language Equations with Invertible Operations},
  author={Lila Kari},
  journal={Theor. Comput. Sci.},
The paper studies language equations of the type X ⋄ L = R and L ⋄ Y = R, where L and R are given languages and ⋄ is an invertible binary word(language) operation. For most of the considered insertion and deletion operations, the existence of both a solution and a singleton solution to these equations proves to be decidable for given regular L and R. In case L is a context-free language and R is a regular one, the existence of a solution is generally undecidable. The results can be extended to… CONTINUE READING

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