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Just a layman and slow learner. Thank you for your enlightenment and patience, and for giving me the best memory in my life.


Dec
18
comment Approximate the unit ball in an infinite-dimensional Hilbert space, by compact sets?
@GEdgar: Are there some examples for proving such generalization in your way?
Dec
18
comment Approximate the unit ball in an infinite-dimensional Hilbert space, by compact sets?
@AlexanderShamov: Are there some examples for proving such generalization in your way?
Dec
18
asked Approximate the unit ball in an infinite-dimensional Hilbert space, by compact sets?
Dec
16
awarded  Nice Question
Dec
15
accepted If $|f_i(x_1) - f_i(x_2)| \leq a$ for all $f_i$'s, does $ | \min_i f_i(x_1) - \min_i f_i(x_2) | \leq a? $
Dec
15
revised If $|f_i(x_1) - f_i(x_2)| \leq a$ for all $f_i$'s, does $ | \min_i f_i(x_1) - \min_i f_i(x_2) | \leq a? $
deleted 13 characters in body
Dec
15
asked If $|f_i(x_1) - f_i(x_2)| \leq a$ for all $f_i$'s, does $ | \min_i f_i(x_1) - \min_i f_i(x_2) | \leq a? $
Dec
13
asked Meaning of “within a constant factor from”?
Dec
10
awarded  Caucus
Dec
10
awarded  Nice Question
Dec
6
accepted Application of Jensen's inequality
Dec
5
comment Application of Jensen's inequality
Thanks. How do you prove my second inequality? @Timbuc?
Dec
5
comment Condition on $f$ for $f(x+y) \leq f(x) + f(y)$?
That's right. I am looking for some inequalities that say some functions are subaddtive or superadditive.
Dec
5
asked Condition on $f$ for $f(x+y) \leq f(x) + f(y)$?
Dec
5
comment Application of Jensen's inequality
@DanielFischer: That's right. The measure should be a probability measure.
Dec
5
awarded  Notable Question
Dec
5
comment Application of Jensen's inequality
So are the two inequalities in my question not because of Jensen's ineq? Are they correct then?
Dec
5
comment Application of Jensen's inequality
convex as in Jensen's inequality en.wikipedia.org/wiki/Jensen%27s_inequality#Statements
Dec
5
asked Application of Jensen's inequality
Dec
4
awarded  Popular Question