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\documentclass{article}
\usepackage[margin=1in]{geometry}
\usepackage{amsmath,amsthm,amssymb,scrextend}
\usepackage{blindtext}
\usepackage{centernot}
\usepackage{enumerate}
\usepackage{enumitem}
\usepackage{fancyhdr}
\pagestyle{fancy}
\usepackage[italian]{babel}
\usepackage{pgfplots}
\usepackage{tikz}
\usepackage{wrapfig}
\pgfplotsset{compat=1.17}
\newcommand{\I}{\mathbb{I}}
\newcommand{\N}{\mathbb{N}}
\newcommand{\R}{\mathbb{R}}
\newcommand{\Q}{\mathbb{Q}}
\newcommand{\Z}{\mathbb{Z}}
\renewcommand{\qed}{\hfill$\blacksquare$}
\let\newproof\proof
\renewenvironment{proof}{\begin{addmargin}[1em]{0em}\begin{newproof}}{\end{newproof}\end{addmargin}\qed}
\newenvironment{corollary}[2][Corollario]{\begin{trivlist}
\item[\hskip \labelsep {\bfseries #1}\hskip \labelsep {\bfseries #2.}]}{\end{trivlist}}
\newenvironment{exercise}[2][Esercizio]{\begin{trivlist}
\item[\hskip \labelsep {\bfseries #1}\hskip \labelsep {\bfseries #2.}]}{\end{trivlist}}
\newenvironment{lemma}[2][Lemma]{\begin{trivlist}
\item[\hskip \labelsep {\bfseries #1}\hskip \labelsep {\bfseries #2.}]}{\end{trivlist}}
\newenvironment{problem}[2][Problema]{\begin{trivlist}
\item[\hskip \labelsep {\bfseries #1}\hskip \labelsep {\bfseries #2.}]}{\end{trivlist}}
\newenvironment{proposition}[2][Proposizione]{\begin{trivlist}
\item[\hskip \labelsep {\bfseries #1}\hskip \labelsep {\bfseries #2.}]}{\end{trivlist}}
\newenvironment{reflection}[2][Riflessione]{\begin{trivlist}
\item[\hskip \labelsep {\bfseries #1}\hskip \labelsep {\bfseries #2.}]}{\end{trivlist}}
\newenvironment{theorem}[2][Teorema]{\begin{trivlist}
\item[\hskip \labelsep {\bfseries #1}\hskip \labelsep {\bfseries #2.}]}{\end{trivlist}}
\begin{document}
\lhead{Gabriel Hearot}
\rhead{\today}
\begin{problem}{1}
\blindtext
\end{problem}
\begin{wrapfigure}{l}{0.45\textwidth}
\begin{tikzpicture}
\begin{axis}[
axis lines = middle,
no markers,
xlabel = $x$,
ylabel = $y$,
enlarge y limits = true,
enlarge x limits = false,
restrict y to domain = -20:20,
]
\addplot [
domain=-10:10,
samples=100,
color=red,
]
{\x+1};
\addlegendentry{$f(x)$}
\addplot [
domain=-10:10,
samples=100,
color=blue,
]
{\x/2};
\addlegendentry{$g(x)$}
\addplot [
smooth,
domain=-10:10,
samples=1000,
color=green,
]
{1/\x};
\addlegendentry{$\frac{1}{x}$}
\node[label={300:{$A$}},circle,fill,inner sep=0.7pt] at (axis cs:-2,-1) {};
\end{axis}
\end{tikzpicture}
\caption{Lorem ipsum dolor sit amet.}
\end{wrapfigure}
\blindtext[2]
\vskip 0.2in
\begin{lemma}{1}
\blindtext
\end{lemma}
\begin{wrapfigure}{l}{0.25\textwidth}
\begin{tikzpicture}[
axis/.style={->,thick},
vector/.style={-stealth},
]
\shade[ball color = gray!40, opacity = 0.4] (0,0) circle (2cm);
\draw (0,0) circle (2cm);
\draw (-2,0) arc (180:360:2 and 0.6);
\draw[dashed] (2,0) arc (0:180:2 and 0.6);
\fill[fill=black] (0,0) circle (1pt);
\draw[axis] (0,0) -- (2,0,0);
\draw[axis] (0,0) -- (0,0,-1.4);
\draw[axis] (0,0) -- (0,2,0);
\draw[vector] (1.4,0,-0.4) -- node[label={55:$\vec{d}$}]{} (0.2,0,-1.2);
\draw[vector] (0,0) -- node[anchor=south east]{$\vec{\omega}$} (0,1.3,0);
\end{tikzpicture}
\caption{Lorem ipsum dolor sit amet.}
\end{wrapfigure}
\blindmathpaper
\end{document}