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$Y$ \leq $Y$\lambda$k$+1.  \forall $K$ \in \|1, \wedge-1
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    Please write your posts so they have a question, and provide examples as a complete small document that people can test. But you should delete all the $ the entire expression should be in a single math formula say between \[ and \] – David Carlisle Mar 28 at 15:36
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    I humbly suggest you to look at learnlatex.org/en/lesson-10 (and possibly the rest of that site). It is time we'll invested! – Rmano Mar 28 at 15:38
  • Another good intro to writing mathematical expressions in LaTeX is Chapter 3, "Typesetting mathematical formulae" [sic] of The not so short introduction to LaTeX2e by Tobias Oetiker and others. – Mico Mar 28 at 15:41
  • Don't use \wedge; use \Lambda instead. – Mico Mar 28 at 15:43
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    This is suspiciously similar to tex.stackexchange.com/q/590376/107497 – Teepeemm Mar 28 at 15:46
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For the double brackets you can use stmaryrd, the rest is pretty much straight forward.

\documentclass[]{article}

\usepackage[]{amsmath}
\usepackage{stmaryrd}

\begin{document}
\[
  y_{\lambda_{k}} \geq y_{\lambda_{k+1}} \quad
  \forall k\in\llbracket1,\lvert\Lambda\rvert-1\rrbracket
\]
\end{document}

enter image description here

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  • Thank you, it works ill take your advice – Lila Toth Mar 28 at 15:43

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