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6h
revised Rational function between a constant and a third root
edited body
6h
revised Rational function between a constant and a third root
edited body
7h
revised Rational function between a constant and a third root
added 3 characters in body
7h
comment Rational function between a constant and a third root
@MXYMXY Clearly the degree of $P$ must equal the degree of $Q$. Otherwise $f$ would either grow too fast for the upper bound or decrease too fast for the lower bound
7h
asked Rational function between a constant and a third root
9h
revised Optimizing value of discrete harmonic function at a given point
added 20 characters in body
9h
answered How to prove this result about the interlacing of eigenvalues.
Apr
27
comment Find smallest k for which the inequality holds
What did you try ? What are your thoughts ?
Apr
26
asked Optimizing value of discrete harmonic function at a given point
Apr
24
revised Prove that for any $A \neq 0$ there is a matrix $B$ such that $A + B$ and $B$ have no eigenvalues in common.
added 414 characters in body
Apr
24
answered Prove that for any $A \neq 0$ there is a matrix $B$ such that $A + B$ and $B$ have no eigenvalues in common.
Apr
22
accepted Denominator is product of irreducibles with cyclic Galois group
Apr
21
comment Estimate the bound of the sum of the roots of $1/x+\ln x=a$ where $a>1$
@Chip This second problem is of no use to me either. Thanks for your feedback
Apr
21
comment Description of certain invariant polynomials (not a group action)
@user062295 1) Which part of my question is unclear to you ? 2) If you think that there is in fact a group action here, could you describe the group $G$ and the action ? Because I don't see any so far.
Apr
20
comment $\det(ABC) = \det(B)\det(AC)$?
When $B$ is the identity matrix, for example.
Apr
20
comment Estimate the bound of the sum of the roots of $1/x+\ln x=a$ where $a>1$
@Chip Wow! I'm so flattered that you're asking me to solve a question which you think is unworthy of being asked at MSE ...
Apr
19
comment Given $U,v,w$ find $u \in U$ that value of $||u-w|| + || v - u||$ will be minimal
Sorry, my bad, the situation is a little bit more complicated than I thought, I finally included an answer
Apr
19
answered Given $U,v,w$ find $u \in U$ that value of $||u-w|| + || v - u||$ will be minimal
Apr
19
comment Given $U,v,w$ find $u \in U$ that value of $||u-w|| + || v - u||$ will be minimal
@IlanAizelmanWS You might want to look up the words you don't understand in Google/Wikipedia/whatever, or ask about them here. user1952009 has also added a little bit of additional help for you above
Apr
19
comment Given $U,v,w$ find $u \in U$ that value of $||u-w|| + || v - u||$ will be minimal
There is a one-line complete answer : By the triangle inequality, $||v-u||+||u-w|| \geq ||v-w||$ with equality iff $u$ is a convex combination of $u$ and $v$. No wonder people like user1592009 are surprised by your question