ƚ` pQ K .  `&  & MathType-@h@hTimes New Roman؟ww wf-2 x$xy2 Mmy2 by2 ~yy2 my2 |2mx2 Mmx2 |bx2 |~yxSymbolz )؟ww wf-2 x=x2 -x2 n=x2 |-x & "Systemf !-