@INCOLLECTION{Sands:Computing,
  author = {David Sands},
  title = {Computing with Contexts: {A} simple approach},
  booktitle = {Second Workshop on Higher-Order Operational Techniques in
                     Semantics (HOOTS II)},
  editor = {A. D. Gordon and A. M. Pitts and C. L. Talcott},
  series = {Electronic Notes in Theoretical Computer Science},
  year = {1998},
  volume = {10},
  publisher = {Elsevier Science Publishers B.V.},
  url_Paper = {http://www.cse.chalmers.se/~dave/papers/ENTCS10-sands.pdf},
  abstract = {This article describes how the use of a higher-order syntax
representation of contexts [due to A. Pitts] combines smoothly with
higher-order syntax for evaluation rules, so that definitions can be
extended to work over contexts. This provides "for free" - without the
development of any new language-specific context calculi - evaluation rules
for contexts which commute with hole-filling.  We have found this to be a
useful technique for directly reasoning about operational equivalence. A
small illustration is given based on a unique fixed-point induction
principle for a notion of guarded context in a functional language.},
}

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