[Tex/LaTex] Diagram with tikz

Question

Hi¡ I'm workin with a diagram and I don't know how to do. I almost finished it but the last part is so difficult. Can you help me?
I want to my diagram looks like

And the code that I have is the next

\begin{tikzpicture}[edge from parent/.style={draw,-latex}]
\node {Lindelöf} [sibling distance=6cm]
child {node {Casi Lindelöf}
child {node {Débilmente Lindelöf} [sibling distance=1.5cm]
}
}
;
\end{tikzpicture}

From that I obtain the diagram of the image without the blue part. How can I conclude it? I really appreciate any help you can provide me.

Answer 1

One way is to add a node relative to the tree.

\documentclass[tikz,border=3.14mm]{standalone}
\usetikzlibrary{trees,positioning}
\begin{document}
\begin{tikzpicture}[edge from parent/.style={draw,-latex}]
\node (Lin) {Lindel\"of} [sibling distance=6cm]
child {node {Casi Lindel\"of}
child {node {D\'ebilmente Lindel\"of} [sibling distance=1.5cm]
}
}
;
\node[left=of Lin-1-1] (text) {text};
\draw[-latex] (Lin) -- (text);
\draw[-latex] (text) -- (Lin-1-1);
\end{tikzpicture}
\end{document}

Or with \draw[-latex] (Lin.south west) -- (text);

I would also like to draw your attention to the forest package.

\documentclass{article}
\usepackage[edges]{forest}
\begin{document}
\begin{forest}
for tree={edge={-latex},calign=last,l+=5mm,s+=5mm}
 [Lindel\"of 
    [text,tier=murmel,alias=l]
    [Casi Lindel\"of
       [D\'ebilmente Lindel\"of,tier=murmel,alias=b]
    ]
 ]
\draw[-latex] (l) -- (b);
\end{forest}
\end{document}