deletions | additions       diff --git a/Ex 1.tex b/Ex 1.tex  index 3c5fdda..4a58249 100644  --- a/Ex 1.tex  +++ b/Ex 1.tex 
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\begin{split}  & \wp{\ie{x < 0}{y := -x}{ y := x }}{R} \\  \iff & (x < 0 \to \wp{y:= -x}{R}) \land (0 \leq x \to \wp{y:= x}{R})\\  \iff & x (x  < 0 \to (0 \leq -x \land (0 \leq x \to -x = x) \land (x < 0 \to -x = -x )) )))  \land & (x \leq 0 \to (0 \leq x \land (0 \leq x \to x = x) \land (x < 0 \to x = -x)))  \end{split}  \end{equation}