deletions | additions       diff --git a/4b2.tex b/4b2.tex  index b887888..2282359 100644  --- a/4b2.tex  +++ b/4b2.tex 
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\newcommand{\empty}{\varnothing}  \newcommand{\wp}[2]{wp\left(#1, #2\right)}  \newcommand{\if}[2]{if\left(#1\right) \ \{ #2 \}}  \newcommand{\else}[1]{else \ \{ #1 \}}  \newcommand{\ie}[3]{\if{#1}{#2} \ \else{#3}}  \newcommand{\a}[0]{\ \land \ }  \newcommand{\mtt}[1]{\text{#1}}  \newcommand{\mbb}[1]{\mathbf{#1}}  \newcommand{\T}[0]{\mbb{\top}}  \newcommand{\F}[0]{\mbb{\bot}}  \newcommand{\rule}[1]{\ (\mbb{§#1})}  \subsection{I holds after each execution of the loop}  We are proving that $I \a B \to \wp{S}{I}$