Pauline Ercute
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 Jul2 awarded Curious Jun6 awarded Citizen Patrol Jun6 awarded Benefactor Jun6 accepted Let $x = h(y, z), y = g(x, z), x = h(y, z)$ to calculate partial derivatives? May30 revised Let $x = h(y, z), y = g(x, z), x = h(y, z)$ to calculate partial derivatives? added 36 characters in body; edited tags; edited title May30 comment 2 by 2 Linear Homogenous System with Complex Eigenvalue. Boyce, p409, Question 7.6.4 @GitGud thanks you May30 revised If first 1 by 1 upper left submatrix (principal minor) = 0, conclude straightaway saddle point ? - Question 8 added 92 characters in body May30 asked Determinant with Levi-Civita Symbol? May30 awarded Commentator May30 comment For $f(x,y,z,\ w)=x^{5}+xy^{2}-zw$, how is this stationary point $\;$ a saddle point? - Question 14 and can you move your comments into your answer, thanks? May30 comment For $f(x,y,z,\ w)=x^{5}+xy^{2}-zw$, how is this stationary point $\;$ a saddle point? - Question 14 Sorry but i still don't understand. it's too complicated. my class doesn't do taylor expansion? May29 awarded Promoter May29 comment For $f(x,y,z,\ w)=x^{5}+xy^{2}-zw$, how is this stationary point $\;$ a saddle point? - Question 14 I don't understnad your answer sorry. How does it answer my question? May29 comment 2 by 2 Linear Homogenous System with Complex Eigenvalue. Boyce, p409, Question 7.6.4 @GitGud thanks. but what were they trying to do? or should i just ignore everything under ther red line? May21 revised For $f(x,y,z,\ w)=x^{5}+xy^{2}-zw$, how is this stationary point $\;$ a saddle point? - Question 14 edited title May21 asked If first 1 by 1 upper left submatrix (principal minor) = 0, conclude straightaway saddle point ? - Question 8 May21 asked For $f(x,y,z,\ w)=x^{5}+xy^{2}-zw$, how is this stationary point $\;$ a saddle point? - Question 14 May21 comment Intuition or wisdom for stability and instability properties of locally linear system. Boyce, p513, Table 9.3.1 @snarski i updated my question. please edify me now? May21 revised Intuition or wisdom for stability and instability properties of locally linear system. Boyce, p513, Table 9.3.1 added 315 characters in body May21 asked Intuition or wisdom for stability and instability properties of locally linear system. Boyce, p513, Table 9.3.1