On 04/06/2016 21:19, Paul A. Rubin wrote:
Kiuhnm <kiuhnm2015 <at> gmail.com> writes:

I'm using Lyx 2.1.4. I'd like to write a bunch of inequalities with an
\iff on the right side. The inequalities should be centered, like this:
<centered inequality1> <=>
<centered inequality2> <=>
<...>

Does the appended LyX file do what you want? I used the alignat environment,
and increased the number of columns to five. The left side of each
inequality goes in column 1, the inequality symbol in column 2, the right
side in column 4 and the iff symbol in column 5. Column 3 is intentionally
blank.

I came up with a (not so clean) solution:

#LyX 2.1 created this file. For more info see http://www.lyx.org/
\lyxformat 474
\begin_document
\begin_header
\textclass article
\use_default_options true
\maintain_unincluded_children false
\language english
\language_package default
\inputencoding auto
\fontencoding global
\font_roman default
\font_sans default
\font_typewriter default
\font_math auto
\font_default_family default
\use_non_tex_fonts false
\font_sc false
\font_osf false
\font_sf_scale 100
\font_tt_scale 100
\graphics default
\default_output_format default
\output_sync 0
\bibtex_command default
\index_command default
\paperfontsize default
\use_hyperref false
\papersize default
\use_geometry false
\use_package amsmath 1
\use_package amssymb 1
\use_package cancel 1
\use_package esint 1
\use_package mathdots 1
\use_package mathtools 1
\use_package mhchem 1
\use_package stackrel 1
\use_package stmaryrd 1
\use_package undertilde 1
\cite_engine basic
\cite_engine_type default
\biblio_style plain
\use_bibtopic false
\use_indices false
\paperorientation portrait
\suppress_date false
\justification true
\use_refstyle 1
\index Index
\shortcut idx
\color #008000
\end_index
\secnumdepth 3
\tocdepth 3
\paragraph_separation indent
\paragraph_indentation default
\quotes_language english
\papercolumns 1
\papersides 1
\paperpagestyle default
\tracking_changes false
\output_changes false
\html_math_output 0
\html_css_as_file 0
\html_be_strict false
\end_header

\begin_body

\begin_layout Standard
\begin_inset Formula
\begin{align*}
\begin{gathered}H(Z)\leq\mathbb{E}_{Z}\lceil I(Z)\rceil<H(Z)+1\\
nH(X)\leq\mathbb{E}_{Z}\lceil I(Z)\rceil<nH(X)+1\\
H(X)\leq\frac{\mathbb{E}_{Z}\lceil I(Z)\rceil}{n}<H(X)+\frac{1}{n}.
\end{gathered}
& \begin{gathered}\vphantom{H(Z)\leq\mathbb{E}_{Z}\lceil I(Z)\rceil<H(Z)+1}\iff\\
\vphantom{nH(X)\leq\mathbb{E}_{Z}\lceil I(Z)\rceil<nH(X)+1}\iff\\
\vphantom{H(X)\leq\frac{\mathbb{E}_{Z}\lceil I(Z)\rceil}{n}<H(X)+\frac{1}{n}.}
\end{gathered}
\end{align*}

\end_inset


\end_layout

\end_body
\end_document



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