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awarded  Yearling
Nov
26
awarded  Popular Question
Nov
4
awarded  Notable Question
Jul
2
awarded  Curious
Mar
31
asked Derivation of split-step Padé approximation to a parabolic equation
Mar
28
accepted Approximation to the square root
Mar
28
asked Approximation to the square root
Feb
21
awarded  Popular Question
Nov
8
comment Show that two matrices with the same eigenvalues are similar
The one step that is a bit confusing, is the last one. You say that $y$ are the basis, but why does that mean they drop out of the equality?
Nov
8
comment Show that two matrices with the same eigenvalues are similar
Ok, that makes sense, though I think there is a misplaced equals sign when showing that $P$ is non singular
Nov
8
accepted Show that two matrices with the same eigenvalues are similar
Nov
7
asked Show that two matrices with the same eigenvalues are similar
Oct
30
comment Show that $N(A^T A) \subset N(A)$
$Ab$ is orthogonal to itself which must mean that it equals zero. Is that right?
Oct
30
asked Show that $N(A^T A) \subset N(A)$
Oct
29
revised Show that $\phi(B_n(1)) = B_n(r)$
added 27 characters in body
Oct
29
comment Show that $\phi(B_n(1)) = B_n(r)$
For general $E \subset \mathbb R^n$ phi is defined as $\phi(E) = \lbrace \phi(x)\in \mathbb R^n: x\in E\rbrace$
Oct
29
asked Show that $\phi(B_n(1)) = B_n(r)$
Oct
19
comment Prove Reverse Fatou's lemma
So are you saying that $\liminf f_k = \limsup f_k$ because $f_k$ is bounded above by $f$? I thought that only applied if the limit existed.
Oct
19
comment Prove Reverse Fatou's lemma
Lets say I have $f_k \leq f$ where $f$ is integrable, I still don't see how to move forward.
Oct
19
comment Prove Reverse Fatou's lemma
Is that not what $f_k \leq g_j$ says? $f_k$ is dominated by the integrable function $g_j$.