[Jprogramming] atop continues to puzzle me

[Linda Alvord]

Plain text may be better:

a=:?>:i.6
]a=:=a
]b=:?>:i.6
a #@# b
NB.  x u@v y ↔ u x v y 
#a#b
NB.  ([: f g)"({. g b. 0) <=> f@g
a(([:##)"({.# b. 0))b
a #@:# b

Linda

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