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2d
awarded  Famous Question
Jul
22
awarded  Notable Question
May
9
comment Understanding Borel sets
I do expect to see more up-vote!
May
9
accepted Real analysis: Show the limit $\lim nμ(E_n) = 0$.
May
9
asked Real analysis: Show the limit $\lim nμ(E_n) = 0$.
May
3
awarded  Popular Question
Mar
3
accepted What is space B(X,R)?
Mar
3
comment What is space B(X,R)?
Great! For A, does the domain and codomain of function contained in A?
Mar
3
revised What is space B(X,R)?
added 151 characters in body
Mar
3
asked What is space B(X,R)?
Mar
2
comment Real analysis: Show a continuous and nonnegative function on $[a, b]$ = 0
I got it! One more question about detail. I do not know why do we need $x$. We naturally have $f(x_0)>1/2f(x_0)$, since it is a positive.
Feb
27
accepted Real analysis: Show a continuous and nonnegative function on $[a, b]$ = 0
Feb
26
accepted Show $\sum_{n=0}^{\infty}\binom{n+k}{k}z^{n}=\frac{1}{(1-z)^{k+1}}$
Feb
26
asked Show $\sum_{n=0}^{\infty}\binom{n+k}{k}z^{n}=\frac{1}{(1-z)^{k+1}}$
Feb
21
awarded  Nice Question
Feb
18
comment Real analysis: Show a continuous and nonnegative function on $[a, b]$ = 0
Great. Could you explain the last sentence?
Feb
18
awarded  Popular Question
Feb
18
asked Real analysis: Show a continuous and nonnegative function on $[a, b]$ = 0
Feb
12
accepted How to show a set is closed.
Feb
12
comment How to show a set is closed.
I do not get the reason for the following statement:There exists a sequence fn in A such that fn→f uniformly on C([0,1],ℝ)"