Dan Bron wrote: DB> As an intersting aside, &] is sort of an "identity adverb", in that DB> (u y) -: u&] y and (x u y) -: x u&] y .
Almost. The ranks of u (? ? ?) vs u&] (_ _ _) may differ.
The effects become visible only within suitable contexts, for example
1 <@ + 2 3
+-+-+
|3|4|
+-+-+
1 <@(+&]) 2 3
+---+
|3 4|
+---+
Martin
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