Re: stretchy sum product and integral [Was: MathML in Firefox 3 beta 5 (Mozilla 1.9)]

Karl Tomlinson escribió:
 > On Mon, 28 Apr 2008 23:44:03 +0200, Alvaro wrote:
 >
 >> Sum, Product and Integral should not stretch arbitrarily,
 >
 > I'd be interested to hear why you say that?

Open any good math or physics text book and look at its equations. Or 
look at the output by LaTeX. These two are better sources of what math 
should look like than a standard, IMHO.

The symbol for Sum, Product, Union, Intersection, etc. is a big Sigma, 
Pi, U, ... but of a fixed size

> I had thought that Sum and Product looked better without
> stretching to enclose their contents but that maybe due to looking
> at too much LaTeX output.
> 
> The MathML spec explicitly says: "Also, operators such as ∑,
> ∫, /, and vertical arrows stretch vertically by default."
> 
> http://www.w3.org/TR/2003/REC-MathML2-20031021/chapter3.html#id.3.2.5.8.2

I did read that line from the spec I think it is wrong. I prefer proper 
looking *math* rendering than following blindy a spec. :-)


> UTR #25 also indicates that these sometimes stretch.
> "Large Operators include n-ary operators like summation and
> integration. They may expand in size to fit their associated
> expressions."
> 
> http://www.unicode.org/reports/tr25/tr25-9.html#_Toc323