u=:>:`<: y=:0 satisfies your stated requirements, though violates your implicit requirement (which would be that u is a verb -- I would expect m as the placeholder if you were expecting a gerund).
Also, I am not aware of and official documentation discussing the use of a gerund as the left argument for ^: -- Raul ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
