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What are {curly brackets} for in GNU-APL?

As far as I know, GNU-APL uses the APL Iso standard.

manlio
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Anon
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    A search for the opening brace in http://www.gnu.org/software/apl/apl.html suggests that braces are a part of the syntax for Direct Functions (Lambdas), both named and unnamed. – Robert Harvey Jun 09 '14 at 18:24

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GNU APL implements direct definition notation, lambdas, not unlike NGN/APL and Dyalog APL.

Lobachevsky
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