Anti-Unification for Unranked Terms and Hedges

Temur Kutsia, Jordi Levy & Mateu Villaret
We study anti-unification for unranked terms and hedges that may contain term and hedge variables. The anti-unification problem of two hedges ~s_1 and ~s_2 is concerned with finding their generalization, a hedge ~q such that both ~s_1 and ~s_2 are instances of ~q under some substitutions. Hedge variables help to fill in gaps in generalizations, while term variables abstract single (sub)terms with different top function symbols. First, we design a complete and minimal algorithm to...
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