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1d
revised Prove this is a rectangle
edited body
1d
comment Prove this is a rectangle
@soktinpk Alright, then I show that the assumption $D\ne D'$ is absurd. That's not fishy
1d
answered Prove this is a rectangle
1d
answered Is it possible to find a vector that is orthogonal to this set?
1d
answered trying to prove the following convergence result
1d
comment Why doesn't the derivative of a holomorphic function vanish in a border maximum?
Let $G=\mathbb C$, $f(z)=1-z^2$, $K=[0,1]$, $a=0$. Then $\max_{z\in K}|f(z)|=1=|f(a)|$. And we have $f'(a)=0$.
1d
comment Show every chain has an upperbound?
Your example, the set of all numbers $<\sqrt 2$ does not have a maximal element, so it is certainly not automatically true that you have a max element.
1d
comment $A$ is diagonalizable if $A^8+A^2=I$
OR: A muiltiple root of $f(X)=X^8+X^2-1$ is a common root of $f$ and $f'$, but $f'(X)=8X^7+2X$ and $Xf'(X)-8f(X)=2X^2+8$, so a multiple root $\lambda$ would have $\lambda^2=-4$, $\lambda^8=256$, so $f(\lambda)=256-4+1\ne0$, i.e., there is no multiple root.
1d
comment Most efficient algorithm to distribute n n-bit strings among n people
Is it on purpose that $N$ the number of people equals $N$ the length of bitstrign, but not necessarily $n$ the number of ones?
1d
comment circle-shaped wave
Wouldn't $y=\sin x$ look nicer anyway?
1d
comment Mathematical concepts named after mathematicians that have become acceptable to spell in lowercase form (e.g. abelian)?
So nobody mentioned eigenvalues (after the German mathematician Karl-Friedrich Eigen) and binomial (after the Italian Giuseppe Binomi)? ;) -- Seriously, I have often heard the question from whose names these adjectives are derived :)
1d
comment Why lower case “a” for “abelian group” and upper case “C” for “Cauchy sequence”?
Of course the German rules are even stranger: Abel'sche Gruppe, Gauß'sche Glockenkurve, Ohm'sches Gesetz versus abelsche Gruppe, gaußsche Glockenkurve, ohmsches Gesetz
1d
awarded  examples-counterexamples
2d
answered Isomorphism between vector spaces of linear transformations
2d
comment Properties of a non-constant analytic map from the annulus $A(0,1,2)$ to the unit disk such that $\lvert f(z)\rvert = 1$ on $\partial A(0,1,2)$
Is the unit sphere the unit disk?
2d
answered Can Zorn's Lemma be 'inverted' like this:?
2d
reviewed Approve Nicolas Choquet problem of bottles
2d
answered Nicolas Choquet problem of bottles
2d
answered If the boundary of a convex set in $\mathbb R^n$ ($n>1$) is connected , is it necessarily also path-connected ?
2d
revised Connected-ness of the boundary of convex sets in $\mathbb R^n$ , $n>1$ , under additional assumptions of the convex set being compact or bounded
added 1307 characters in body