3
\begin{equation}
\Phi s=\frac{E{\tiny t} r(S,\overline S̄ )+Etrv(S,\overline S̄ )}{|S|(9 )}  
\end{equation}

enter image description here

2
  • 3
    You want a subscript so: E_{tr} Nov 28 '21 at 12:43
  • 1
    Welcome to TeX.SE.
    – Mico
    Nov 28 '21 at 13:01
6

You should use _ to initiate subscript mode while in math mode. For sure, you need to replace \Phi s, E{\tiny t} r, and Etrv with \Phi_{s}, E_{tr}, and E_{trv}, respectively. Incidentally, \tiny is a text-mode command; don't use in math mode.

Depending on what the subscripts tr and trv mean, they should maybe be rendered in upright ("roman") rather than slanted ("italic") lettering. Both possibilities are pursued in the following code and associated screenshot.

enter image description here

\documentclass{article}
\usepackage{amsmath}
\usepackage{newtxtext,newtxmath} %  optional (for Times Roman text and math font)

\begin{document}
\begin{align*}
\phi_{S}(W)
&=\frac{E_{tr}(S,\bar{S})+E_{trv}(S,\bar{S})\cdot W}{|S|\cdot(3+6W)} \\[\jot]
&=\frac{E_{\mathrm{tr}}(S,\bar{S})+E_{\mathrm{trv}}(S,\bar{S})\cdot W}{|S|\cdot(3+6W)}
\end{align*}
\end{document}
2
  • :-) there is a missing (W): to see \upphi_s(W). +1.
    – Sebastiano
    Nov 28 '21 at 13:01
  • 1
    @Sebastiano - Good catch! Let me fix that right away.
    – Mico
    Nov 28 '21 at 13:02
4

Just for fun here a possible solution:

enter image description here

\documentclass[a4paper,12pt]{article}
\usepackage{newtxtext,newtxmath}
\usepackage{alphabeta}

\begin{document}
\begin{equation}
\upphi_s(W)=\frac{ E_{\textup{tr}}(S,\overline S)+E_{\textup{trv}}(S,\overline S)\cdot W}{|S|\cdot (3+6W)},  
\end{equation}
\end{document}

I think, peraphs, that your \upphi is of stix font!

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