In math mode, the spaces between subscripts and letters are not always the same, but depending on the preceding letters!
See e.g. (different colours indicate different spaces)
Is it the feature of packages {amssymb}
{amsmath}
or ....
Equations using {newtxmath}
math font:
\begin{equation}
\left.
\begin{array} {c}
\displaystyle \frac{\partial\epsilon_f}{\partial t} + \nabla \cdot (\epsilon_f \boldsymbol{u}_f) = 0 \\
\displaystyle \frac{\partial (\rho_f \epsilon_f \boldsymbol{u}_f)}{\partial t} + \nabla \cdot (\rho_f \epsilon_f \boldsymbol{u}_f \boldsymbol{u}_f) = -\epsilon_f \nabla p + \mu \nabla^2(\epsilon_f \boldsymbol{u}_f) + \boldsymbol{f}_b
\end{array}
\right\}
\end{equation}
Is there any global setting/solution for this issue, i.e. to adjust the spacing automatically depending on the letters and subscripts?
EDIT: put {bm}
package after amsmath
and font
packages will significantly improve the spacing.
newtxmath
I'd like to recommend themtpro2
package, whoselite
version is free. it has a package optionsubscriptcorrection
, which deals exactly with the kind of problem you have.Readme
pfmtpro2
package. Some of the mathematical symbols and operators seem to be improved a lot. Does the free versionlite
provide these features?