### Abstract

Isabelle/Isar provides named cases to structure proofs. This article contains an implementation of a proof method `casify`, which can be used to easily extend proof tools with support for named cases. Such a proof tool must produce labeled subgoals, which are then interpreted by `casify`.

As examples, this work contains verification condition generators producing named cases for three languages: The Hoare language from `HOL/Library`, a monadic language for computations with failure (inspired by the AutoCorres tool), and a language of conditional expressions. These VCGs are demonstrated by a number of example programs.

### License

BSD License

### Topics

- Tools
- Computer science/Programming languages/Misc

### Session Case_Labeling

- Case_Labeling
- Labeled_Hoare
- Labeled_Hoare_Examples
- Conditionals
- Monadic_Language
- Case_Labeling_Examples

### Used by

- Planarity Certificates

## Cite

×

Case_Labeling-AFP

    @article{Case_Labeling-AFP,
      author  = {Lars Noschinski},
      title   = {Generating Cases from Labeled Subgoals},
      journal = {Archive of Formal Proofs},
      month   = {July},
      year    = {2015},
      note    = {\url{https://isa-afp.org/entries/Case_Labeling.html},
                 Formal proof development},
      ISSN    = {2150-914x},
    }

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