Oleg wrote:
>   =:  Is
>   =.  Seems

Harvey responded:
>  "Seems" carries a connotation of possible unreality (that is, 
>  appearance but not necessarily substance). 

I agree.  Same problem with "acts" (but we do have "Joe is the acting 
President" which could be expressed as "Joe =. President").
But we have a number of options:

   http://en.wikipedia.org/wiki/List_of_English_copulae

 (I never realized how many copulae English has!)

>  Perhaps "becomes" might be 
>  closer to the intent:

Trouble is, having "become" (=.), the subject attains the state of "is", 
identically to "=:".

>  Or another approach might be that "global" conceptually 
>  encompasses more ("plural") than "local":
>   =:  Are
>   =.  Is

I would say plurality maps more closely onto multiple indirect assignment as:

         Joe       =: foo       NB.  Joe "is" foo
        'Joe Bob'  =: foo       NB.  Joe and Bob "are" foo
        'Joe Bob'  =: foo ; bar NB.  Joe and Bob are foo and bar, respectively

This applies regardless of whether we use =: or =. (and regardless of the type 
of multiple indirect assignment we use, e.g. (;:Joe
Bob')=. ... ).  

But maybe there is a different word for ('`Joe Bob'=. gerund), because the 
gerund will be evoked.  This is kind of a double, or
symmetric, indirection (and also Joe and Bob could become any part of speech). 

-Dan

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