minor fix

gradual.tex

@@ -114,12 +114,12 @@ functions as follows:
   \textsc{[AbsInf+]}
   \frac
   {
-    \begin{align*}
+    \begin{aligned}
     \Gamma,x:&\sigma\vdash e\triangleright\psi \qquad \qquad \Gamma,x:\sigma\vdash e:\tau\\
     T = \{ (\sigma, \tau) \} 
       &\cup \{ (\sigma,\tau) ~|~ \sigma \in \psi(x) \land \Gamma, x: \sigma \vdash e: \tau \}\\
       &\cup \{ (\sigma^*,\tau) ~|~ \sigma \in \psi(x) \land \Gamma, x: \sigma^* \vdash e: \tau \}
-    \end{align*}
+    \end{aligned}
   }
   {
     \Gamma\vdash\lambda x:\sigma.e:\textstyle\bigwedge_{(\sigma,\tau) \in T}\sigma\to \tau

proofs.tex

@@ -968,8 +968,8 @@
             \begin{theorem}[Soundness of the algorithm]
               \begin{align*}
                 &\forall \Gamma, e, t.\ \tyof e \Gamma \leq t \Rightarrow \Gamma \vdash e:t\\
-                &\forall \Gamma, e, t, \varpi.\ \pvdash \Gamma e t \varpi:\env {\Gamma,e,t} (\varpi)\\
-                &\forall \Gamma, e, t.\ \Gamma \evdash e t \Refine {e,t} \Gamma
+                &\forall \Gamma, e, t, \varpi.\ \tyof e \Gamma \neq \tsempty \Rightarrow \pvdash \Gamma e t \varpi:\env {\Gamma,e,t} (\varpi)\\
+                &\forall \Gamma, e, t.\ \tyof e \Gamma \neq \tsempty \Rightarrow \Gamma \evdash e t \Refine {e,t} \Gamma
               \end{align*}
             \end{theorem}