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Tie | m`n m`v u`n u`v |

In English, a gerund is a noun that carries the force of a verb, as does the noun cooking in the art of cooking. The tie applies to two verbs to produce a gerund. Gerunds are commonly used with insert (`/`) and with agenda (`@.`):

       ]g=: +`*
    +-+-+
    |+|*|
    +-+-+

       (g/1 2 3 4 5) ; (1+2*3+4*5)
    +--+--+
    |47|47|
    +--+--+

More generally, tie produces gerunds as follows:`u`v` is`au,av` ,`` where`au` and`av` are the (boxed noun) atomic representations`` (`5!:1`)`` of`u` and`v` .`` Moreover,`m`n` is`m,n` and`m`v` is`m,av` and`u`n` is`au,n` .`` See Bernecky and Hui [12]. Gerunds may also be produced directly by boxing. Thus:

       ]h=: '+' ; '*'
    +-+-+
    |+|*|
    +-+-+

       h/1 2 3 4 5
    47

The atomic representation of a noun (used so as to distinguish a noun such as`'+'` from the verb`+`)`` is given by the following function:

       (ar=: [: < (,'0')"_ ; ]) '+'
    +-----+
    |+-+-+|
    ||0|+||
    |+-+-+|
    +-----+

       *`(ar '+')
    +-+-----+
    |*|+-+-+|
    | ||0|+||
    | |+-+-+|
    +-+-----+

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