for F being non 2 -characteristic Field
for E being FieldExtension of F
for a being Element of F st ( for b being Element of F holds not a = b ^2 ) holds
for b being Element of E st b ^2 = a holds
( FAdj (F,{b}) is SplittingField of X^2- a & deg ((FAdj (F,{b})),F) = 2 )