ƚ @ qQ a .  @ &  & MathTypePSymbol- Xww 0wf-2 (ySymbol ww 0wf-2 S)ySymbol- Yww 0wf-2 (ySymbol ww 0wf-2 )ySymbol- Zww 0wf-2 {(ySymbol ww 0wf-2  )yTimes New Romanww 0wf-2  9y2 V3y2 3y2 :2y Times New Romanww 0wf-2 2ySymbol- \ww 0wf-2  +y2 <+y2 -yTimes New Romanww 0wf-2 xy2 @xy2 xy & "Systemf !-