thinkbayes DocBook: display math is too small and looks terrible about thinkstats HOT 8 CLOSED

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This is much better now that the attributes generated in tralics are getting 
passed along and rendered in the MathML generated by plasTeX.

Only two remaining issues I see:

1) Sqrt symbol is too heavy, but that seems to be a MathML thing.

2) The Sigma and Pi for \sum and \prod are too small.  Looks like displaystyle 
is not getting propagated?

Reference on displaystyle

http://www.w3.org/TR/REC-MathML/chap3_4.html

Looks like it can be an "part of the environment inherited by the rendering 
process of every MathML expression".  Looks like it is set in an <mstyle> tag.  
So maybe I should be generating a top-level <mstyle> tag with 
displaystyle="true"?

Here's the DocBook for the equation at the top of page 112:

<informalequation><mml:math mode="display" overflow="scroll" 
xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:munder><mml:mo>∑
</mml:mo><mml:mi>i</mml:mi></mml:munder><mml:mo>-</mml:mo><mml:mo 
form="prefix">log</mml:mo><mml:mi>σ</mml:mi><mml:mo>-</mml:mo><mml:mfrac><mml:m
n>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac><mml:msup><mml:mfenced open="(" 
close=")" 
separators=""><mml:mfrac><mml:mrow><mml:msub><mml:mi>x</mml:mi><mml:mi>i</mml:mi
></mml:msub><mml:mo>-</mml:mo><mml:mi>μ</mml:mi></mml:mrow><mml:mi>σ</mml:mi><
/mml:mfrac></mml:mfenced><mml:mn>2</mml:mn></mml:msup></mml:mrow></mml:math></in
formalequation>


Two issues: the minus sign should be treated as a prefix operator, so the space 
between - and log should be smaller.

And the sigma should be bigger.

From Sanders:

We're now testing an upgraded version of the MathML rendering that should 
resolve the issues below, but it's still experimental,
so we're triggering it with a new "role" on the book element:

<book role="animal-ah61">

Would this be something you could generate in your DocBook output? If so, I'd 
recommend doing that moving forward to make
sure you're seeing our latest and greatest MathML rendering.

Anyway, I regenerated a PDF using that "role" and you can grab the results on 
the Atlas dashboard. Take a look and let me know
if the equation on page 112 looks good to you now.

Added

<book role="animal-ah61">

to Renderers/DocBook/Themes/book/default-layout.xml

Ok, I am declaring this "good enough" and closing the issue.