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fixed a new line split
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frap.tex
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frap.tex
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@ -517,8 +517,7 @@ It's important to remember that plus \emph{inside} the brackets is syntax, while
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\newcommand{\subst}[3]{[#3/#2]#1}
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\newcommand{\subst}[3]{[#3/#2]#1}
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To test our semantics, we define a \emph{variable substitution} function\index{substitution}.
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To test our semantics, we define a \emph{variable substitution} function\index{substitution}.
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A substitution $\subst{e}{x}{e'}$ stands for the result of running through the syntax of $e$, repla
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A substitution $\subst{e}{x}{e'}$ stands for the result of running through the syntax of $e$, replacing every occurrence of variable $x$ with expression $e'$.
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cing every occurrence of variable $x$ with expression $e'$.
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\begin{eqnarray*}
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\begin{eqnarray*}
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\subst{n}{x}{e} &=& n \\
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\subst{n}{x}{e} &=& n \\
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