
doi: 10.2307/2346629
In most computer languages, the data are regarded as being held in machine storage either as individual scalar quantities or as members of rectangular arrays. It would make these languages more useful if the user were allowed to specify the shapes of other structures in which he wished to consider the data as being held, such as triangular arrays, trees, etc. To go with the ability to define structures the user would require the ability to define operators to act upon structures.
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