​Bl​B​(P​2​XP​2​) with B=P​1​XP​1

​For X=Bl​B​(P​2​XP​2​) with B=P​1XP​1 the Landau-Ginzburg potential is given by f(z​1,​z​2​,w​1​,w​2​)=z​1+z​2+w​1+w​2+1/z​1z​2+1/w​1w​2​+1/z​1z​2w​1w​2.
The action of U​t​ is given in the z​1 andĀ w​1 coordinates by:
​Action of V​t is given in the z​1 and w​1 coordinates as follows
​Action of ​W​t​D​ for D=V​X(e​i​) with i=1,2 is given in the z​1 and w​1 coordinates as follows
​Action of ​W​t​D ​for D=V​X​(e​i​) with i=3,4 is given in the z1 and w​1 coordinates as follows
​Action of ​W ​t​D ​for D=V​X(e​i​)-V​X​(v​3​) with i=1,2 is given in the z​1 ​and w​1 ​coordinates as follows
​Action of ​W​t​D ​for D=V​X​(e​i​)-V​X​(v​2​) with i=3,4 is given in the z and w coordinates as follows
​Action of ​W​t​D ​for D=V​X​(v​3​) is given in the z​1 and w​1 coordinates by
​Action of ​W'​t​D ​for D=V​X​(v​3​) is given in the z​1 and w​1 coordinates by