# Equation structure is hard, i wrote it this way below [closed]

$Y$ \leq $Y$\lambda$k$+1.  \forall $K$ \in \|1, \wedge-1

• 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
• 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
• This is suspiciously similar to tex.stackexchange.com/q/590376/107497 – Teepeemm Mar 28 at 15:46

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}


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