From J Wiki
(u b.) y Verb Information Adverb
Generates one of 3 diagnostic functions associated with verb u according to the value of flag y
y resulting function _1 the linear representation of the obverse of u 0 the (monad,dyad) ranks of u 1 the linear representation of the identity function of u
u=: ^ NB. antilogarithm u b. _1 NB. what is the obverse of u? --the logarithm. ^. u=: < u b. 0 NB. what are the ranks of u? _ 0 0
1. Discover the basic characteristics of a given verb.
2. Find the rank(s) of a given verb.