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How can I write this letters (in blue) in LaTeX ? its look like $z$ enter image description here

Some help would be appreciated

David Carlisle
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John john
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    I'm honestly struggling to understand this question. The bold z is \mathbf{z} and italic z with subscript italic ij is z_{ij}, but none of these are Greek letters? – Au101 Aug 16 '18 at 19:11

1 Answers1

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Here the code for your formula.

enter image description here

\documentclass{article}

\usepackage{newtxtext,newtxmath}

\begin{document}

\[
  \mathbf{z} = \{ z_{ij}; i = 1, 2, \ldots, n_a; j = 1, 2, \ldots, n_a - i + 1 \}
\]

\end{document}
Werner
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Sebastiano
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  • @DavidCarlisle Kind David I have removed an extra package. Do I think it's more correct now or do I need to change something? In my opinion the image seems the same. – Sebastiano Aug 16 '18 at 19:26
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    @Sebastiano: times is obsolete. Also, to keep things minimal, I removed the 12pt font class option and the use of mathtools. – Werner Aug 16 '18 at 19:40
  • @Werner As I have written to you before, the best ones are authorized to make the necessary changes to my codes. Thank you very much. – Sebastiano Aug 16 '18 at 19:42