ƚ@ R i .  @& & MathTypePSymbol ؟ww w f-2 1(ySymbol ؟ww w f-2 )ySymbol ؟ww w f-2 (ySymbol ؟ww w f-2  )ySymbol ؟ww w f-2  (ySymbol ؟ww w f-2 T)yTimes New Roman؟ww w f-2  4y2 2y2 2y2 r2y Times New Roman؟ww w f-2 s 2ySymbol ؟ww w f-2 b +y2 +y2 -y2 :=yTimes New Roman؟ww w f-2  yy2 yy2 yy & "System f !-