2

I want to write these equations using the \begin{equation} , however can't align them to the left side and want to put only one reference number for them

\begin{equation}
\begin{split}
S=-\frac{1}{2}\rho v \delta \left(\frac{\ mu}{pF}\right)^{1/2} e \sin{\theta} \\
T = -\frac{1}{2}\rho v \delta \left(\frac{\mu}{pF}\right)^{1/2} \left( 1+e \cos{\theta}- r\alpha \left(\frac{p}{\mu}\right)^{1/2} \cos{i} \right)
\end{split}
\end{equation}

this is the output of my code enter image description here

but i want to align my equations like in the following picture

enter image description here

help me thanks :)

  • What you is left-aligned, or do I misunderstand what you want? – Bernard Jul 17 at 14:13
  • I also have some trouble understanding your question. Could you show a screenshot of the output you have now, and a mockup screenshot of the output that you want to have? – Marijn Jul 17 at 14:50
  • edited , the first picture is my output , the second picture is the output that i want – Quintis Jul 17 at 15:16
3

Your code doesn't produce the image.

However, use the proper markup:

\documentclass{article}
\usepackage{amsmath}

\begin{document}

\begin{equation}
\begin{split}
S &= -\frac{1}{2}\rho v \delta \left(\frac{\mu}{pF}\right)^{\!1/2} e \sin\theta \\
T &= -\frac{1}{2}\rho v \delta \left(\frac{\mu}{pF}\right)^{\!1/2}
      \biggl( 1+e \cos\theta- r\alpha \left(\frac{p}{\mu}\right)^{\!1/2} \cos i \biggr) \\
W &= -\frac{1}{2}\rho v \delta \frac{r\alpha}{\sqrt{F}}\sin i \cos(\omega+\theta)
\end{split}
\end{equation}

\end{document}

Note that I changed \left( and \right) to \biggl( and \biggr) that produce correctly sized fences. Also \sin{\theta} can be more simply \sin\theta.

I also added a negative thin space to the exponents, in order not to have them too far from the parenthesis.

enter image description here

2

My humble proposal. You can replace each of your equations with a, b, c, d and e.

enter image description here

\documentclass[a4paper,12pt]{book}
\usepackage{amsmath}
\begin{document}
\chapter{Name}
\begin{equation}
\begin{aligned} 
    a&= b \\
    c&= d \\
    e&= f 
\end{aligned}
\end{equation}
\end{document}

For example:

S& =-\frac{1}{2}\rho v \delta \left(\frac{\mu}{pF}\right)^{1/2} e \sin\theta \\

instead of a&= b

  • For a more systematic handling of numbering you could have a look to my answer to tex.stackexchange.com/q/470400/33514 – Jhor Jul 17 at 20:56
  • @Jhor Welcome :-) Thank you very much for your detailed answer. If you prefer you are authorized to edit my code. There is no problem for me. – Sebastiano Jul 17 at 21:09

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