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Jun
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accepted Let $x = h(y, z), y = g(x, z), x = h(y, z)$ to calculate partial derivatives?
May
30
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
May
30
comment 2 by 2 Linear Homogenous System with Complex Eigenvalue. Boyce, p409, Question 7.6.4
@GitGud thanks you
May
30
revised If first 1 by 1 upper left submatrix (principal minor) = 0, conclude straightaway saddle point ? - Question 8
added 92 characters in body
May
30
asked Determinant with Levi-Civita Symbol?
May
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awarded  Commentator
May
30
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?
May
30
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?
May
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awarded  Promoter
May
29
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?
May
29
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?
May
21
revised For $f(x,y,z,\ w)=x^{5}+xy^{2}-zw$, how is this stationary point $\;$ a saddle point? - Question 14
edited title
May
21
asked If first 1 by 1 upper left submatrix (principal minor) = 0, conclude straightaway saddle point ? - Question 8
May
21
asked For $f(x,y,z,\ w)=x^{5}+xy^{2}-zw$, how is this stationary point $\;$ a saddle point? - Question 14
May
21
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?
May
21
revised Intuition or wisdom for stability and instability properties of locally linear system. Boyce, p513, Table 9.3.1
added 315 characters in body
May
21
asked Intuition or wisdom for stability and instability properties of locally linear system. Boyce, p513, Table 9.3.1