Pascal, did you mean something like this? Your a2 has an error.

a=: 2 : ('u@v';':';'u v')
   
   a3=: 0 :('u@V';':';'U V')
      
      
   a
2 : 0
u@v
:
u v
)
   
   a3
┌───┬─┬───┐
│u@V│:│U V│
└───┴─┴───┘
   
   
I don’t know what this  thread id abouttt. This is just a guess.

Linda

-----Original Message-----
From: Programming <[email protected]> On Behalf Of 
'Pascal Jasmin' via Programming
Sent: Saturday, October 6, 2018 8:39 PM
To: Programming Forum <[email protected]>
Subject: [Jprogramming] bug in j806 (I think) ambivalent explicit conjunction

a =: 2 : ('u@v';':';'u v')
   a2 : 0u@v:u v)
so far so good...
  - a +- +
it just assumes that result expression is dyadic workaround is to use tacit 
version of : in return value of a, but this doesn't seem like it is working 
right.
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