Bug report

Bug summary

LaTeX parser error with \overset symbol

Code for reproduction

import matplotlib.pyplot as plt
plt.text(0, 0, r"$x \overset{f}{\rightarrow} y$")

Actual outcome

ValueError: 
x \overset{f}\rightarrow y
  ^
Unknown symbol: \overset, found '\'  (at char 2), (line:1, col:3)

Expected outcome

overset: http://tex.wikidot.com/snippets:overset-and-underset

Matplotlib version

• Operating system: macOS 10.15.5
• Matplotlib version: 3.3.0
• Matplotlib backend (print(matplotlib.get_backend())): module://ipykernel.pylab.backend_inline
• Python version: Python 3.7.7
• Jupyter version: 6.0.3 (IPython 7.13.0)

matplotlib installed with pip.