[Tex/LaTex] Ladder diagrams using Tikz

Question

This is a ladder diagram I need help in drawing it using Tikz, please help me.

Answer 1

You can use a \foreach loop like this:

\documentclass[tikz,border=2pt]{standalone}
\usetikzlibrary{positioning,quotes}
\begin{document}

\begin{tikzpicture}
  \node(g-0){$G_{i_0}$};
  \node(h-0)[below right=1cm of g-0]{$h_{j_0}$};
  \foreach \i [count=\j from 0]in {1,...,3}{
  \ifnum\i<3{
    \node [right=2cm of g-\j](g-\i){$G_{i_\i}$}; 
    \node [right=2cm of h-\j](h-\i){$H_{j_\i}$};
  }\else{
    \node [right=2cm of g-\j](g-\i){$G_{i_\i} \dots$}; 
    \node [right=2cm of h-\j](h-\i){$\dots$};
  }\fi
  \path (g-\j) edge[<-,"$\lambda_{i_\j i_\i}$"] (g-\i) edge[<-] (h-\j);
  \path (h-\j) edge[<-] (g-\i) edge[<-,"$\mu_{j_\j j_\i}$"] (h-\i);
  }
\end{tikzpicture}

\end{document}