I'm having a lot of trouble figuring out how to draw the following directed graph: 
Could someone help me/provide insight on how to make these myself in the future?
- What have you tried? Please show us your minimal working example (MWE).Henri Menke– Henri Menke2018-06-13 09:13:40 +00:00Commented Jun 13, 2018 at 9:13
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3 Answers
This site is full of examples. You could use tikz-cd, plain TikZ, PSTricks and so on. Here is an example using forest.
\documentclass[tikz,border=10pt]{standalone} \usepackage{forest} \begin{document} % starting point: https://tex.stackexchange.com/a/341454/121799 \begin{forest} for tree={ font=\sffamily, line width=1pt, child anchor=north, parent anchor=south, grow=south, align=center, edge path={ \noexpand\path[line width=1pt, \forestoption{edge},-latex] (!u) -- () \forestoption{edge label}; }, }, s sep+=20pt, [Rings [Commutative\\ Rings [Commutative Rings\\ with identity,name=cr [Integer domains,l*=2,name=id] ] ] [Rings\\ with unity,name=ru [Division rings [Fields,l*=2,name=fld] ] ] ] \begin{scope}[line width=1pt] \draw[-latex] (ru) -- (cr); \draw[-latex] (id) -- (fld); \end{scope} \end{forest} \end{document} 
Here's a short code with pstricks:
\documentclass[border=12pt]{standalone} \usepackage[utf8]{inputenc} \usepackage{fourier} \usepackage{pst-node} %\usepackage{auto-pst-pdf} % to compile with pdflatex \usepackage[usestackEOL]{stackengine} \begin{document} \begin{psmatrix}[arrows=->, arrowinset=0, colsep=0.8cm, nodesep=6pt] &[name=R] Rings \\ [name=CR] \Shortunderstack{Commutative\\Rings} & & [name=RU]\Shortunderstack{Rings with \\Unity} \\ [name=CRI] \Shortunderstack{Commutative Rings\\ with Identity} & & [name=DR] Division Rings \\ [name=ID] Integral Domains & & [name=F] Fields \foreach \s/\t in {R/CR, R/RU, CR/CRI, RU/DR, RU/CRI, CRI/ID, DR/F, ID/F}{\ncline{\s}{\t}} \end{psmatrix} \end{document} 
an alternative/competitive forest solution:
\documentclass[border=10pt]{standalone} \usepackage{forest} \usetikzlibrary{arrows.meta} \begin{document} \begin{forest} for tree={ font=\sffamily\linespread{.84}\selectfont, text centered, align=center, anchor=north, l sep=5mm, s sep=8mm, edge = {thick, -Stealth} } [Rings [Commutative\\ Rings [Commutative Rings\\ with identity,name=A [Integer domains,tier=word,name=B] ] ] [Rings\\ with unity,name=C [Division rings [Fields,tier=word,name=D] ] ] ] \draw[thick, -Stealth] (C) edge (A) (B) to (D); \end{forest} \end{document} 
