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I am trying the process performing on a matrix to reduce it to echelon and reduced echelon form as shown in figure I search a lot and tried like $^R\sim$. I am trying to write the symbol used for row equivalence between two matrices but can not write.

enter image description here

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  • 2
    \stackrel{\scriptscriptstyle R}{\sim} should work (IMO the R on the image is why to large so I made it smaller)
    – daleif
    Apr 9 '20 at 15:02
  • Please clarify your typesetting objective. Is to write the letter R with a tilde symbol underneath it?
    – Mico
    Apr 9 '20 at 15:04
  • @Mico Yes sir! R with a tilde underneath
    – Noor Aslam
    Apr 9 '20 at 15:08
  • @NoorAslam - Does the output of \documentclass{article} \usepackage{accents} \begin{document} $\underaccent{\tilde}{R}$ \end{document} meet your needs?
    – Mico
    Apr 9 '20 at 15:10
  • 2
    It is definitely not an R with a \sim under it. It is a \sim with an R above it. I made the R smaller because on the image the R takes all the attention, but it is just a marker. As far as I remember the R just means that this equivalence is made using a row operation, and this the \sim is the important part not the size of the R.
    – daleif
    Apr 9 '20 at 15:28
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Just for example I have created the last matrix of your image with edit by very good user @egreg:

%% Compile and read me!
\documentclass[a4paper,12pt]{article}
\usepackage{mathtools}
\usepackage{newtxtext,newtxmath}
\begin{document}
\[\mathrel{\underset{\sim}{R}}\begin{bmatrix} 
1 & 0 & 0 \\ 
0 & 1 & 0 \\ 
0 & 0 & 0  
\end{bmatrix}
\begin{matrix} 
\\
\,\text{by }\,\mathsf{R}_{1}+\mathsf{R}_{3}\text{ and }\,\mathsf{R}_{2}-\mathsf{2R}_{3}\\
\\
\end{matrix}\]
\end{document}

enter image description here

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  • 1
    It should be \mathrel{\underset{\sim}{R}}
    – egreg
    Apr 9 '20 at 17:23

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