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visits member for 1 year, 9 months
seen Jun 27 at 6:25

Jul
2
awarded  Curious
Jul
2
awarded  Inquisitive
Jun
18
accepted In a normed space $X$ with field $\mathbb{R}$, is $\{ x \in X \mid \|x\| =1\}$ compact in general?
Jun
18
asked In a normed space $X$ with field $\mathbb{R}$, is $\{ x \in X \mid \|x\| =1\}$ compact in general?
Jun
17
asked A bounded sequence in $C[a,b]$ (normed by maximum norm) that has no convergent subsequence
Jun
17
asked Prove the derivative of $x^2 \sin (1/x^2)$ is not (Lebesgue) integrable on $[0,1]$
Jun
3
reviewed Approve suggested edit on Understanding the proof of Hahn's Lemma (Royden, Real Analysis, p. 344)
Jun
3
asked Understanding the proof of Hahn's Lemma (Royden, Real Analysis, p. 344)
May
31
accepted The meaning of functor $M \mapsto \mbox{Hom}_A(P,M)$ being exact
May
26
comment A proposition on exact sequence of inverse limit (Lang, Algebra, p. 165)
That is $ \lim_{N}C_n \to \lim_{M}C_n$ where $N\geq M$ and the similar types.
May
26
asked A proposition on exact sequence of inverse limit (Lang, Algebra, p. 165)
May
24
revised The class of finite groups (models) and that of countable groups are not elementary classes (a generalized version).
deleted 7 characters in body
May
24
asked The class of finite groups (models) and that of countable groups are not elementary classes (a generalized version).
May
24
accepted $\mathbb{Q}$ field axioms & fund. thm. $\models \sigma$ iff $\mathbb{Z}_p$ field axioms & fund. thm. $\models \sigma$ for all large prime $p$
May
24
revised $\mathbb{Q}$ field axioms & fund. thm. $\models \sigma$ iff $\mathbb{Z}_p$ field axioms & fund. thm. $\models \sigma$ for all large prime $p$
added 45 characters in body; edited title
May
24
asked $\mathbb{Q}$ field axioms & fund. thm. $\models \sigma$ iff $\mathbb{Z}_p$ field axioms & fund. thm. $\models \sigma$ for all large prime $p$
May
22
asked Why $\ln x \in L^p ( (0, 1] )$ for $1\leq p < \infty$?
May
14
comment The meaning of functor $M \mapsto \mbox{Hom}_A(P,M)$ being exact
Please let me check and clarify the def. once more: So $P$ is called projective if the exactness of $0\to M' \to M \to M''$ implies the exactness of the induced sequence, right?
May
14
revised The meaning of functor $M \mapsto \mbox{Hom}_A(P,M)$ being exact
added 6 characters in body
May
14
asked The meaning of functor $M \mapsto \mbox{Hom}_A(P,M)$ being exact