[OS X TeX] Size of braces and parentheses in split environment

[Iraj Kalantari]

Dear Experts,

Having experienced something like this which I did not record at the  
time, I experimented with Raul's test file.

Oddly (to my inexpert disposition), what causes the discrepancy in the  
size of the braces are the exponents in the two lines.  An exponent of  
'4' or a '7' in either line will make the size of the braces larger.

Is it the font that causes it?   When should one watch out for this  
kind of behavior?

Iraj Kalantari






On Aug 18, 2008, at 1:43 PM, R Martinez wrote:

> Axel,
>
> Many thanks for your reply.
>
> After reading your comments I experimented with my file and  
> discovered that the delimiter size discrepancy occurs when I use the  
> command \usepackage{exscale,relsize}. The delimiter size discrepancy  
> does not occur when I comment out this command.
>
> Since I need to use these packages,  I will follow your advice and  
> set the delimiter size myself.
>
> I welcome your comments.
>
> Regards,
>
> Raul Martinez
>
> Here's the test file
> --------------------
> \documentclass[12pt]{article}
>
> %-------Packages----------------------------------------
>
> \usepackage{lmodern}
> \usepackage[T1]{fontenc}
> \usepackage{textcomp}
> \usepackage{amsmath,amssymb,bm}
> \usepackage{exscale,relsize}
>
> \begin{document}
>
>
> \begin{equation}
> \begin{split}
> 	K_z  &= \frac{1}{\left( \sigma_{x}^{2} + \sigma_{y}^{2}\right)^{2}}  
> \: \left(\mathcal{E} \left\{\left( X- \eta_x \right)^4 \right\} +  
> \mathcal{E} \left\{\left( Y- \eta_y \right)^4 \right\} \right. \\
> 	& \quad \quad +\left. 2\,\mathcal{E} \left\{\left( X- \eta_x  
> \right)^2 \left( Y- \eta_y \right)^2 \right\}  \right)
> \end{split}
> \end{equation}
>
>
> \end{document}
>
> ----------------------------------------------
>
> On Aug 18, 2008, at 12:15 AM, Axel E. Retif wrote:
>
>> On  17 Aug, 2008, at 16:49, R Martinez wrote:
>>
>>> All,
>>>
>>> The following display equation using a split environment produces  
>>> curly braces and parentheses of different sizes in each line of  
>>> the expression. I would like both lines to have braces and  
>>> parentheses that have the same size as those in the first line.
>>>
>>> Your help is appreciated.
>>>
>>> \begin{equation}
>>> \begin{split}
>>> 	K_z  &= \frac{1}{\left( \sigma_{x}^{2} +  
>>> \sigma_{y}^{2}\right)^{2}} \: \left(\mathcal{E} \left\{\left( X-  
>>> \eta_x \right)^4 \right\} + \mathcal{E} \left\{\left( Y- \eta_y  
>>> \right)^4 \right\} \right. \\
>>> 	& \quad \quad +\left. 2\,\mathcal{E} \left\{\left( X- \eta_x  
>>> \right)^2 \left( Y- \eta_y \right)^2 \right\}  \right)
>>> \end{split}
>>> \end{equation}
>>
>> I see them equal in both lines, but you will have to tell us which  
>> class, size and font package you're using, as there is a huge  
>> difference, for example, in the relative size of delimiters between  
>> article class at 12pt or 10pt:
>>
>> \documentclass[12pt]{article} % <- change this to 10pt and see the  
>> difference
>> \usepackage{amsmath}
>> \usepackage[T1]{fontenc}
>> \begin{document}
>>
>> Now load the Latin Modern fonts: \usepackage{lmodern} and you will  
>> not see that difference in the relative sizes of delimiters between  
>> 10pt and 12pt.
>>
>> Now load TXfonts: \usepackage{txfonts}, and you'll see \left( X-  
>> \eta_x \right)^2 is not equal to \left( Y- \eta_y \right)^2.
>>
>> I think the best for you is to set the sizes yourself: see page 56 of
>>
>> http://www.ctan.org/get/info/lshort/english/lshort.pdf
>>
>> and especially section 8 of
>>
>> http://www.ctan.org/get/info/math/voss/mathmode/Mathmode.pdf
>>
>> Best,
>>
>> Axel
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>
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>