Henry Rich wrote:
It IS a property of J.  In your example, both frames are empty.
There is no frame that is longer than the other, so there's
nothing to repeat.

True, for all verbs of a given rank, the same set of cells are handled. This is a property of J as a whole. The result of how a given verb applies to a given pair of cells depends on the specific verb.

Take the following session excerpt:
  1 2 3 (+"0) 1 2 3
1 1
2 2
3 3
  1 2 3 (+"0) 1 2 3
2 4 6

Each sentence has 3 result cells. In the first case, the cells are rank-1, in the second, rank 0. The frame in each case is 3. So the result shapes are (3,2) and (3,'') or 3 2 and 3.

I wonder if Terrence is trying to understand the documents over the interpreter. To me, understanding J is easier and more satisfying than understanding meta-J.
It's like

'abc' , 'defg'

The rank of , is infinite, so there is no frame.  You have to go to
the definition of , to see what it does with its operands.
Do you not mean that the frame is empty?
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