ƚ  V Y .    &  & MathTypePSymbol ww 0wH f-2 ~S(ySymbolh ww 0wH f-2 ~)yTimes New Romanww 0wH f-2  by2 ay2 by2 aySymbolh ww 0wH f-2 -y2 -y2 =y2 +y2 :-y & "SystemH f !-