some fixes

new_system3.tex

@@ -133,7 +133,7 @@ The elements of $\Gamma\avdash\Gammap\ct e:t$ mean:
 \qquad
 \Infer[NoDef]
 { x\in\dom\Gammap\setminus\bv(e)\\
-\Gamma\subst{x}{(\Gamma\land\Gammap)(x)} \avdash{\Gammap\setminus\{x\}}{\ct} e : S}
+\Gamma\subst{x}{\Gamma(x)\land\Gammap(x)} \avdash{\Gammap\setminus\{x\}}{\ct} e : S}
 {\Gamma \avdash\Gammap{\ct} e : S}
 { }
 \\