Math & Science ⇒ No numbering for equations

[LatexBeginnerrrr]

Hello everyone

I am trying to figure out how to delete the automatic numbers - (1), (2)... - that appear next to my equations. I read somewhere I should use \begin{align*} ... \end{align*} instead of \begin{equation} ... \end{equation}, but that ruins my fractions.
This is what I put in LaTeX:

Code: Select all

We krijgen voor het SIR-model de volgende set differentiaalvergelijkingen: 
\begin{equation}
    \frac{dS(t)}{dt} = -\beta.(\frac{S(t)}{P}).I(t) + \alpha R(t) + \mu (P-S(t))
\end{equation}
\begin{equation}
    \frac{dI(t)}{dt} = \beta.(\frac{S(t)}{P}).I(t) - \gamma I(t) - \mu I(t)
\end{equation}
\begin{equation}
    \frac{dR(t)}{dt} = \gamma.I(t) - \alpha R(t) - \mu R(t)
\end{equation}

Does anyone know how to fix this?
Thank you very much.

[user22741]

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\[
\frac{dS(t)}{dt} = -\beta.(\frac{S(t)}{P}).I(t) + \alpha R(t) + \mu (P-S(t))
\]

[Johannes_B]

I would use gather.

Code: Select all

\documentclass{article}
\usepackage{mathtools}
\begin{document}
\begin{gather*}
    \frac{dS(t)}{dt} = -\beta.(\frac{S(t)}{P}).I(t) + \alpha R(t) + \mu (P-S(t))\\
    \frac{dI(t)}{dt} = \beta.(\frac{S(t)}{P}).I(t) - \gamma I(t) - \mu I(t)\\
    \frac{dR(t)}{dt} = \gamma.I(t) - \alpha R(t) - \mu R(t)
\end{gather*}
\end{document}