Update HOME_EXAM_Type_check_part2.md

HOME_EXAM_Type_check_part2.md

@@ -68,25 +68,25 @@ or
 ```
 
 Not equals (!=):
-```math
+$`
 \frac{\Gamma \ \vdash \ e1 \ : \ bool \quad \Gamma \ \vdash \ e2 \ : \ bool}{\Gamma \ \vdash (e1 \ != \ e2) \ : \ bool}
-```
+`$
 or
-```math
+$`
 \frac{\Gamma \ \vdash \ e1 \ : \ i32 \quad \Gamma \ \vdash \ e2 \ : \ i32}{\Gamma \ \vdash (e1 \ != \ e2) \ : \ bool}
-```
+`$
 
 ### Assignment
 Given the type $`\tau`$, variable $`x`$ and value $`n`$
 
-```math
+$`
 \frac{\Gamma \ \vdash \ x \ : \ \tau \quad \Gamma \ \vdash \ n \ : \ \tau}{\lang x := n, \sigma \rang \ \Darr \ \Gamma \ \vdash x \ : \ \tau}
-```
+`$
 
 ### **let** assignment
-```math
+$`
 \frac{\Gamma \ \vdash \ n \ : \ \tau}{\lang \text{let} \  x \ : \ \tau \ := \ n, \sigma \rang \ \Darr \ \Gamma \ \vdash x \ : \ \tau}
-```
+`$
 
 ### **while** statement
 The condition, $`b`$, of the while statement