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Mar
11
revised Prove the set of sequences $c_0$ which converge to zero in $l_{\infty}$ is closed.
changed $l_0$ to $c_0$
Mar
11
comment Prove the set of sequences $c_0$ which converge to zero in $l_{\infty}$ is closed.
you're right I mis-typed it, I'll fix.
Mar
11
accepted Prove the set of sequences $c_0$ which converge to zero in $l_{\infty}$ is closed.
Mar
11
comment Prove the set of sequences $c_0$ which converge to zero in $l_{\infty}$ is closed.
damn that's slick.
Mar
11
revised Prove the set of sequences $c_0$ which converge to zero in $l_{\infty}$ is closed.
added 3 characters in body
Mar
11
asked Prove the set of sequences $c_0$ which converge to zero in $l_{\infty}$ is closed.
Jan
29
revised Prove this matrix is invertible for $n < m-1$
added 1 characters in body
Jan
29
accepted Prove this matrix is invertible for $n < m-1$
Jan
29
comment Prove this matrix is invertible for $n < m-1$
awesome answer, thanks.
Jan
29
revised Prove this matrix is invertible for $n < m-1$
[Edit removed during grace period]
Jan
29
revised Prove this matrix is invertible for $n < m-1$
deleted 8 characters in body
Jan
29
revised Prove this matrix is invertible for $n < m-1$
added 248 characters in body
Jan
29
revised Prove this matrix is invertible for $n < m-1$
deleted 72 characters in body
Jan
29
asked Prove this matrix is invertible for $n < m-1$
Dec
29
awarded  Popular Question
Nov
3
comment Singularities in (Elementary) Real Algebraic Geometry
The cubic is $y^3+2y^2+y+(v-u^2)=0$, the roots will be $functions$ of $u$ and $v$, that's what I'm after, so that I can prove that $f(x,y)=(u(x,y),v(x,y))=(x,x^2-(y+1)^3+(y+1)^2)$ has an inverse which is analytic.
Nov
3
comment Singularities in (Elementary) Real Algebraic Geometry
I'm having trouble understanding. Solving $v=f(u,y)$ for $y$ will give me 3 roots, each a function of $u$ and $v$, I should expect that one of these roots is a real analytic function in a nbhd of $(0,0)$, correct?
Nov
3
revised Singularities in (Elementary) Real Algebraic Geometry
added 72 characters in body
Nov
3
revised Singularities in (Elementary) Real Algebraic Geometry
added 1 characters in body
Nov
3
asked Singularities in (Elementary) Real Algebraic Geometry