docs/2016-11-02-geometry.md

@@ -78,12 +78,12 @@ Here a sample:
   - `stairs` take additionally
     `<up px="-5.0" py="2" />` and 	`<down px="0.0" py="2"/>`, which are 
 	used for visualisation purposes.
-- $$A\_x,\; B\_y,\text{and}\; C$$ are optional parameter for the explicit plane equation of the subroom,
+- $`A\_x,\; B\_y,\text{and}\; C`$ are optional parameter for the explicit plane equation of the subroom,
    for the construction of a 3D environment and should be used to describe stairs.   
-   The plane equation is given by:  $$Z = Ax +By + C$$. 
+   The plane equation is given by:  $`Z = Ax +By + C`$. 
    For instance, if the stair goes through the following points: 
-   $$P_1(1,0,0),\; P_2 (0,1,0)\; \text{and}\; P_3(0,0,1)$$ 
-   then the equation is given by: $$Z= -x -y +1$$.
+   $`P_1(1,0,0),\; P_2 (0,1,0)\; \text{and}\; P_3(0,0,1)`$ 
+   then the equation is given by: $`Z= -x -y +1`$.
 
 - `polygon` describes the walls as a sequence of vertexes.