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m Vella moved page Freetypes to Free Types |
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Free types exist in Z and in the Rodin theory plugin and are supported by ProB. You can also define new free types in classical B by adding a FREETYPES clause with free type definitions separated by semicolon.
Here is a definition of an inductive type IntList for lists of integers constructed using inil and icons:
FREETYPES IntList = inil, icons(INTEGER*IntList)