ƚ  Y  .1   &W & MathType0- Times New Roman Cyrgw 9 -2 {2y2 o*y Symbol |w|wgw  -2 y2 y2 dy2 ~y2 ~y2 d~y2 -y Times New Roman Cyrgw : -2  vy2 S vy`Times New Roman Cyrgw  -2 qryTimes New Roman Cyrgw ; -2 @4ey & "Systemwf  -