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u^:n Extended | initial writing: 2004-03-22 last updated: 2004-11-01

`u^:(<m)` ,`` previously an error, is defined as follows:

| `u^:(i.m) y` |  | if`m` is a non-negative integer
| `u^:(i.k) y` |  | if`m` is`_` or`''` ,`` where`k` is the smallest positive integer such that`(u^:(k-1) y) -: u^:k y`
| `u^:_1^:(<|m) y` |  | if`m` is negative

Moreover, the monads`{&x^:a:` or`{&x^:(<_)` for integer list`x` and the dyads`{~^:a:` or`{~^:(<_)` are supported by special code.

See the dictionary entry for`u^:n``` for examples.

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