This function constructs the inverse of *
transform*
. If *
T*
is *
transform*
and *
T'*
is its inverse, then *
TT*
' = I. If *
into*
is non-```
nil
```

it is modified to contain *
T'*
and returned, otherwise a new transform is constructed and returned.

LispWorks CAPI Reference Manual - 21 Dec 2009