\documentclass[12pt,a4paper,oneside]{book}
    \usepackage[utf8]{inputenc}
    \usepackage{textgreek}
    \usepackage{amsmath,amssymb,amsthm}
    \usepackage{mathtools}
    \begin{document} 

    \begin{equation*}
    \begin{aligned}
    \theta_1^*(t) ~ P(\theta_1| Y_1^{obs}, Y_2^{(t-1)},…,Y_p^{(t-1)})\\
Y_1^{*(t)} ~ P(Y_1| Y_1^{obs}, Y_2^{(t-1)},…,Y_p^{(t-1)}, theta_1^{*(t)}) %<----stops here
    \end{aligned}
    \end{equation*}
    \end{document}

Hello, I'm trying to input equations into my thesis and I've been trying for quite sometime now, but it always stops at the line indicated in the code. I dont know what I'm doing wrong. Please could someone help me.

  • 2
    (1) welcome, (2) it is always a good idea to cite the error you get. (3) where is \Y defined? (4) You'd probably want \dots instead of (utf8 char) since the latter is apparently defined as something \textellipsis (by inputenc) and as the name suggests this is a text symbol that cannot be used in math mode. – daleif Aug 16 '17 at 15:19
  • and (5) it should be \theta not theta ... – Zarko Aug 16 '17 at 15:21
  • (5) what should this mean: Y_p^(t-1)? currently it makes ( into a superscript, perhaps you meant Y_p^{(t-1)}? (6) you are missing a \ at the end in theta – daleif Aug 16 '17 at 15:21
  • (7) you probably also mean Y_1^{\textyp{obs}} not Y_1^obs – daleif Aug 16 '17 at 15:21
  • Hello, I dont know where I typed the edit reference. I cant see it in my edit in the question. But yes, thanks for pointing it out. The \Y was a typ0 – Ar1229 Aug 16 '17 at 15:23
  1. ~ does not produce a visible symbol; you probably want \sim
  2. should be \dots
  3. Y_p^(t-1) should be Y_p^{t-1};
  4. theta should be \theta
  5. | should be \mid or the spacing would be wrong
  6. ^obs should be ^{\mathrm{obs}} so the superscript is in textual mode and a single object
  7. \Y should probably be Y
  8. you are missing an alignment point

Here is the fixed code:

\documentclass[12pt,a4paper,oneside]{book}
\usepackage[utf8]{inputenc}
\usepackage{amsmath,amssymb,amsthm}

\begin{document}

\begin{equation*}
\begin{aligned}
\theta_1^*(t) &\sim P(\theta_1\mid Y_1^{\mathrm{obs}}, Y_2^{t-1},\dots,Y_p^{t-1})\\
Y_1^*(t) &\sim P(Y_1\mid Y_1^{\mathrm{obs}}, Y_2^{t-1},\dots,Y_p^{t-1},\theta_1^*(t))
\end{aligned}
\end{equation*}
\end{document}

enter image description here

If you wanted a space instead of a ~ symbol:

\documentclass[12pt,a4paper,oneside]{book}
\usepackage[utf8]{inputenc}
\usepackage{amsmath,amssymb,amsthm}

\DeclareMathOperator{\Prob}{\mathnormal{P}}

\begin{document}

\begin{equation*}
\begin{aligned}
&\theta_1^*(t) \Prob(\theta_1\mid Y_1^{\mathrm{obs}}, Y_2^{t-1},\dots,Y_p^{t-1})\\
&Y_1^*(t) \Prob(Y_1\mid Y_1^{\mathrm{obs}}, Y_2^{t-1},\dots,Y_p^{t-1},\theta_1^*(t))
\end{aligned}
\end{equation*}
\end{document}

enter image description here

  • all this was said in comments ... but you not consider given advises – Zarko Aug 16 '17 at 15:30
  • @Zarko Yes, while I was writing my answer. Made CW anyway. – egreg Aug 16 '17 at 15:32
  • @egreg, no, your answer is sufficient. – Zarko Aug 16 '17 at 15:34
  • @Zarko I did, I was incorporating the \theta as the comments were made. – Ar1229 Aug 16 '17 at 15:36
  • @Ar1229, than you should obtain the same solution as egreg provide ! – Zarko Aug 16 '17 at 15:42

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