PNG  IHDR*H0PLTE@@@ftRNSS pHYsetEXtTitleInftyEditor MathImageytEXtAuthorAdministrator*tEXtDescription $ \bm{f}(\bm{x}, \bm{y})=\bm{a}_{\bm{2}\bm{0}}\bm{x}^{\bm{2}}+\bm{a}_{\bm{1}\bm{1}}\bm{x}\bm{y}+\bm{a}_{\bm{0}\bm{2}}\bm{y}^{\bm{2}}+\bm{a}_{\bm{1}\bm{0}}\bm{x}+\bm{a}_{\bm{0}\bm{1}}\bm{y}+\bm{a}_{\bm{0}\bm{0}} $BwtEXtCopyrightInftyProject@$tEXtCreation Time r'rr'rr IDATxYm EPeֺG*h9mi~tl5!6AG!Y !Pd|>Eh>EŽYjz +Pv@9><y Vۨ84!4H,P*8Ef\, 7>q&uWw"P`_͡Y%l+32Gd!ooz 2\o:&>.E[aم/7B/ ^Q?@v}b4NgHcQdBd?J!rM.E[L $(BT*d0îIF NVhvf\"($A]Iu|8rxycRYJny.٬a Kz2=DTOo1(إ{k4@`v[EZ3]Z*Z"uN L"̶/wx?v_e> Cs O2ö<8SP+k6#A[o7/#ocn% .g۲,jMڠe /$į xP y x;~"M/MV:5mgӐݰ6E (`ޞ.]SǞmOb