> From: Nicholas Spies
> 
> On page 18. Geometry of the J Dictionary, of the online documentation
> that came with J, the example definition
> 
>     (length=: +/&.*:) 5 12
> 
> yields 5 12 instead of the displayed 13

Yes I agree that this is a typo in the Dictionary. 
As Kip points out &. should be &.:

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