Fโก(a,1โˆ’ac;z)=(1โˆ’2โขz)1โˆ’aโˆ’cโข(1โˆ’z)cโˆ’1โขFโก(12โข(a+c),12โข(a+cโˆ’1)c;4โขzโข(zโˆ’1)(1โˆ’2โขz)2),