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Epsilon
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 Editor
revised
Upper bound of $\frac{\sum_i c_ia_ie_i}{\sum_i d_ib_if_i}$?
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comment
Upper bound of $\frac{\sum_i c_ia_ie_i}{\sum_i d_ib_if_i}$?
What about if adding the constraints $\frac{a_i}{b_i} \le \xi_i$ and $\frac{e_i}{f_i}\le \eta_i$?
comment
Upper bound of $\frac{\sum_i c_ia_ie_i}{\sum_i d_ib_if_i}$?
Thank you very much. I have spent several days to treat the problem. Your counterexample lets me not to waste further time about it. Now, I'm considering give the problem other constraints to bound it.
asked
Upper bound of $\frac{\sum_i c_ia_ie_i}{\sum_i d_ib_if_i}$?
comment
The geometric explanation of **isotropic position**
Can you give some concrete examples about convex bodies and their isotropic positions? Such as, a sphere, a ellipsoid or a prism? Thank you!
awarded
 Student
asked
The geometric explanation of **isotropic position**
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 Informed