% This diagram represents the relationship between standard number sets
% Copyright Pablo (C) 2021
\begin{tikzpicture}
  % The complex numbers
  \draw (-3,-2.5) rectangle (3,2.5) 
        (3,-2.5) node[right]{$\mathbb{C}$};

  % The real numbers
  \draw (0,0) circle (2) 
        (2, 0) node[left]{$\mathbb{R}$};

  % The rational numbers
  \draw (-0.5,0) circle (1.5) 
        (1,0) node[left]{$\mathbb{Q}$};

  % The integers
  \draw (-1,0) circle (1) 
        (0,0) node[left]{$\mathbb{Z}$};

  % The natural numbers
  \draw (-1.5,0) circle (0.5) 
        (-1.5,0) node{$\mathbb{N}$};
\end{tikzpicture}

