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How do I type 1A in LaTeX as in the snippet below?

enter image description here

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I have used newtxtext, newtxmath to obtain the same fonts of your image.

enter image description here

\documentclass[a4paper,12pt]{article}
\usepackage{newtxtext,newtxmath}
\begin{document}
$A=({}_{1}A, \ldots, {}_{j}A)$
\end{document}

There are different alternatives to obtain your example: using, for example,tensor package which provides for a little bit of a lower subscripts.

enter image description here

\documentclass[a4paper,12pt]{article}
\usepackage{newtxtext,newtxmath}
\usepackage{tensor}
\begin{document}
$A=(\tensor[_1]{A}{}, \ldots, \tensor[_j]{A}{})$
\end{document}
| improve this answer | |
  • What are the packages newtxtext and newtxmath here ? – user2925716 Feb 28 at 18:41
  • @user2925716 Simply to correspond to the character of the image. – Sebastiano Feb 28 at 21:30
  • Sorry, my English is poor, what do you mean by "correspond to the character of the image" ? – user2925716 Feb 28 at 21:43
  • @user2925716 Also mine: to correspond=to have. If you not put newtxtext and newtxmath, but you use amsmath package you will have the CM fonts (computer modern) – Sebastiano Feb 28 at 21:44

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