Chris Rowley writes:
 > > which is the important bit? which is the "unique public de facto
 > > archival and communication language", exactly?
 >
 > You forgot
 >
 > 6 None of the above

You are ducking the (semi-serious) issue. What *do* you mean by the
archival and communication language? the fact that the word "TeX" is
recognized by mathematicians the world over? so long as they don't try
to exchange files....

In case anyone thinks I am just being cynical, my personal interests
are 1) and 5), and the rest can go overboard....

Sebastian