Alex Gian wrote:
>  Thanks Don, that's very valuable to know (don't use tacit for functions
>  - oops, I mean verbs - that aren't referentially transparent).  

"Function" is an appropriate word.  Because more than referentially 
transparent, tacit verbs are _functional_.  That is, for the
same inputs, they always and forever produce the same output.  They can't refer 
to mutable state whatsoever.

Here's a couple of longer posts I made on that topic:

        http://www.jsoftware.com/pipermail/programming/2009-August/016123.html
        http://www.jsoftware.com/pipermail/programming/2009-December/017487.html
        http://www.jsoftware.com/pipermail/programming/2009-December/017497.html

-Dan



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