Empty Frames in SHARP APL
Roland H. Pesch
Introduction
Recapitulation: earlier attempts at solutions
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Prototypes
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Shape Expressions
Surrogate arguments
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An Operator Calculus
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Overtake
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Comparison, evaluation, extension
Nil use with surrogate arguments
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Nil
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No nils in results
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How nils are used
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Required domain extensions
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Fill or type
Conclusion
References