(More of an extended comment)

For me, this works fine using TeX Live 2011 on Windows 7.

```
\documentclass{article}
\usepackage{auto-pst-pdf,chemscheme}
\begin{document}
\begin{figure}
\includegraphics{Test}
\end{figure}
\end{document}
```

My demo file builds as expected using `pdlatex`

or `latex`

-> `dvips`

-> `ps2pdf`

. As egreg says, to say more we'll need an example of what you are doing.

(As an aside, I would urge against using a serif font in your schemes and figures. Sticking to sans serif looks much better for these: see any of the common journal templates.)

Addressing your questions in turn:

To change *only* the math-mode font, while leaving the text-mode font unchanged (cmr, right?), you could load either the `newtxmath`

package or the `mtpro2`

(short for MathTime Professional II) package. (Note that the latter package isn't free; however, a subset of the fonts, called the "lite" set, provides basic lettering capabilities -- but not "fancy" math fonts such as fraktur, caligraphic, curly, and blackboard bold styles -- and *is* free.) The `mtpro2`

font features "optically sized" glyphs for first-level sub- and superscript materials (aka "scriptstyle"-level materials).

- Separately, if you happen to use LuaTeX or XeTeX, you may want to give the "XITS Math" font package a try.
- If you happen to be a font purist: be aware that these font packages technically give you Times Roman, not Times New Roman. And if you're not a font purist? You may be excused for not noticing any differences -- they are are quite subtle.

In math-mode, be careful about making some symbols both bold *and* italics. In mathematics, each font shape and weight is generally understood to impart some special meaning. For sure, do not combine bolding and italics just for *emphasis*. Both `newtxmath`

and `mtpro2`

provide methods for changing the slant of both lowercase and uppercase greek letters.

To make all displayed equations be set flush-left rather than centered, use the document class option `fleqn`

.

How to set the contents of equations more compactly? Aaah, some would opine that MS Word's math mode is far too compact, leading to frequent overlaps of letters on the baseline and those in superscript or subscript position. Good news for you: Both `newtxmath`

and `mtpro2`

render math expressions more compactly than does TeX's default math font (Computer Modern).

Putting these things together and simplifying some of your math code along the way leads to the following modified form of your MWE. The main substantive changes I've made are to replace the `equation`

environment with an `align`

environment and to replace the inner `split`

environment with a `bmatrix`

environment.

```
\documentclass[fleqn]{article}
\usepackage{amsmath}
\newcommand\QSJ{\mathit{QSJ}} % define a couple of acronyms
\newcommand\CML{\mathit{CML}}
\usepackage{newtxtext,newtxmath}
\begin{document}
\begin{equation}
\begin{split}
L_{\CML}( \theta )
&= \Biggl(\, \prod_{g = 1}^{\QSJ - 1}
\prod_{g' = g + 1}^{\QSJ}
P\left( [ y ]_g = [ m ]_g,\ [ y ]_{g'} = [ m ]_{g'} \right)
\Biggr)\\
&= \Biggl(\, \prod_{g = 1}^{\QSJ - 1}
\prod_{g' = g + 1}^{\QSJ}
\begin{bmatrix}
\phantom{-}\Phi_2 ({\tilde \vartheta }_g,{\tilde \vartheta }_{g'},\nu_{gg'})
- \Phi_2 ({\tilde \vartheta }_g,{\tilde \phi }_{g'},\nu _{gg'})\\
- \Phi_2 ({\tilde \phi }_g,{\tilde \vartheta }_{g'},\nu _{gg'})
+ \Phi_2 ({\tilde \phi }_g,{\tilde \phi }_{g'},\nu _{gg'})
\end{bmatrix} \Biggr)
\end{split}
\end{equation}
\end{document}
```

For comparison, here's how the equations look like if the `times`

(for text font) and `mtpro2`

(for math font) packages instead of the `newtxtext`

and `newtxmath`

packages. The overall look is very similar, but the output produced with help of the `newtxmath`

package is a bit more compact.

## Best Answer

One option, using the MathTime Pro II fonts. Unfortunately, the free

`lite`

version does not provide a large number of symbols.