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Apr
22
answered Given a normed space $X$ and $A:X\to\mathbb R$, how can I compute the second Fréchet derivative of $f(t):=A(x_0+th)$ for some $x_0,h\in X$?
Apr
1
revised Repeated Indefinite Integration of Gaussian Integral
deleted 117 characters in body
Apr
1
comment Why is $\text{Exterior}(A) = \text{int}(A^c) = \text{cl}(A)^c$?
@MichaelBurr No problem.
Apr
1
comment Why is $\text{Exterior}(A) = \text{int}(A^c) = \text{cl}(A)^c$?
@MichaelBurr Sure. But there are different definitions of closure and interior out there, so I asked.
Apr
1
comment Intersection of nested compact sets in a Hausdorff space
Then $X = \bigcap_{i=1}^n U_i = U_n$ (the $U_n$ are increasing). But $U_n = X$ gives $X_n = \emptyset$, which is wrong. (If $x \in X$, then $f^{n-1}(x) \in X_n$.
Apr
1
revised Intersection of nested compact sets in a Hausdorff space
edited body
Apr
1
comment Why is $\text{Exterior}(A) = \text{int}(A^c) = \text{cl}(A)^c$?
How do you define $A^°$ and $\bar A$?
Apr
1
answered Intersection of nested compact sets in a Hausdorff space
Apr
1
answered How many numbers are possible from $a^x b^y c^z$?
Apr
1
answered $x$ and $f(x)$ are linear dependent then $f(x) = kx$.
Mar
30
answered Differentiating between standard and non-standard interpretations of 'less than' relation
Mar
25
comment Is there a way to calculate absurdly high powers?
You start from 1 ... usually
Mar
25
awarded  Good Answer
Mar
25
awarded  ring-theory
Mar
24
answered Quotients of $L_1$
Mar
24
comment Can I found $U$, $W$, and $X$ subspace in $V$ which satisfies $(U\cap X)+(W \cap X)\subset(U+W)\cap X.$
What do you denoe by $\subset$? A proper subset, I suppose.
Mar
24
revised Can I found $U$, $W$, and $X$ subspace in $V$ which satisfies $(U\cap X)+(W \cap X)\subset(U+W)\cap X.$
deleted 9 characters in body; edited title
Mar
24
revised Is every ideal of $R$ a sum of a nilpotent ideal and an idempotent ideal?
added 1 character in body
Mar
24
answered Show $\sum_{k=1}^\infty \frac{k^2}{k!} = 2\mathrm{e}$
Mar
23
comment How To differentiate this integral
@Vim edited. $ $