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Jul
1
accepted For this 2 by 2 locally linear system, how to determine that this “indeterminate” critical point is a centre? Boyce, p516, Question 9.3.12
Jul
1
accepted Critcal values of coefficient matrix with parameter where the phrase portrait changes - Boyce, p410, Question 7.6.19
Jul
1
accepted Change of summation index and Rewriting multiple summation as one sum - Induction Proof of Multinomial Theorem
Jul
1
accepted If first 1 by 1 upper left submatrix (principal minor) = 0, conclude straightaway saddle point ? - Question 8
Jul
2
awarded  Curious
Jun
6
awarded  Citizen Patrol
Jun
6
awarded  Benefactor
Jun
6
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
30
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
29
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