🚀 go-pugleaf

The ``FinnAPL Idiom Library'' is published by the 
        Finnish APL Association
        P.O.Box 1005
        SF-00101  Helsinki 10
        FINLAND
The library has hundreds (631 to be exact) of useful phrases.
Some of them are quite elementary, like  -/X  for Alternating sum,
but others are not so simple, like ``Removing duplicates from an ordered
vector'', or ``Polynomial with roots X'', or ``Removing duplicate rows''.
There are two there features of the book that increase its value
immensely:  the SYNONYM LIST, and the PERMUTED INDEX.  The synonym
list has its useful and obvious advantages, but I have never seen
anything like the permuted index before, and it is really nice.
For instance, the entry "polynomial with roots x" appears in at
least two places in the list, under polynomial, and under roots.
The lines for these two entries have the same words, but the
indentation is controlled so that the key word appears in the
middle of the page.  Thus, this entry appears on one page among

                        value of  polynomial with coefficients ...
                                  polynomial with roots X  47
                     derivate of  polynomial X 430

and also on another page among 

               interpretation of  roman numbers 342
                 polynomial with  roots X  47
       ... X left with Y without  rotate  387

I think that you can get the book from APL Press or from FinnAPL directly.
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