added missing m file

projects/project_lif/lif.tex

@@ -94,7 +94,7 @@ time = [0.0:dt:tmax]; % t_i
     \part Response of the passive membrane to a step input. 
 
     Set $V_0=0$. Construct a vector for the input $E(t)$ such that
-    $E(t)=0$ for $t<20$\,ms and $t>70$\,ms and $E(t)=10$\,mV for
+    $E(t)=0$ for $t\le 20$\,ms and $t\ge 70$\,ms and $E(t)=10$\,mV for
     $20$\,ms $<t<70$\,ms. Plot $E(t)$ and the resulting $V(t)$ for
     $t_{max}=120$\,ms.