On Tue, 15 Jul 2008 17:45:58 -0400, Paul Sperry
<plsperry@[EMAIL PROTECTED]
> wrote in
<news:150720081745589130%plsperry@[EMAIL PROTECTED]
> in
alt.algebra.help:
[...]
> "Over" is more informal. "The sum of t(n) over [x,y]" ,
> "the sum of t(n) for all n in [x,y]" and "sum(t(n) : n is
> in [x,y])"
I consider this last notationally incorrect: it should be
sum{t(n) : n in [x, y]}.
> all say the same thing the first is most informal the
> last, most formal. Formality is a good thing.
Up to a point, which varies by context.
[...]
Brian
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