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-\documentclass[12pt]{article}
-\usepackage{fontspec}
-\usepackage{amsmath}
-\usepackage{amssymb}
-\usepackage{amsfonts} 
-\usepackage{wrapfig}
-\usepackage{graphicx}
-\usepackage{pifont}
-\newcommand{\cmark}{\ding{51}}%
-\newcommand{\xmark}{\ding{55}}%
-\usepackage[margin=0.4in]{geometry}
-\setmainfont{FreeSans}
-\graphicspath{ {../images} }
-
-\begin{document}
-2. Энергия частицы в релятивистском случае. Связь энергии, импульса
-и массы.
-\begin{itemize}
-	\setlength\itemsep{0cm}
-	\item $p=m\frac{d\vec r}{d \tau} = m\frac{d \{dx, dy, dz\}}{\sqrt{1 - \frac {v^2}{c^2}}dt} = \gamma m\vec v \hspace{1cm}
-		m\frac{d \vec p}{dt} = \vec F \implies \vec F = \gamma'm\vec v + \gamma m \frac {d\vec v}{dt} = \gamma m \vec a + \frac{\gamma^3mv \dot v}{c^2}\vec v\\
-		\vec v \frac{d(\gamma m \vec v)}{dt} = \vec v \vec F,\quad E = \gamma mc^2,\quad E^2 = [v^2 = \frac{p^2c^2}{c^2m^2 + p^2}] = m^2c^4 + p^2c^2,\quad p = \vec v \frac E {c^2}$
-\end{itemize}
-\end{document}
-