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age 23
visits member for 2 years, 6 months
seen Jul 20 at 22:14

Doing math.


May
14
answered Show that if sup{∑|f(a)|}<∞, then {a∈A:f(a) is not zer0} is countable.
May
13
answered Any idea of how to prove this
May
13
answered Motivation of vector bundle of a manifold
May
11
answered Equivalent definitions of vector field
May
6
answered Openess of sets given by equivalence relations in the quotient topology.
May
2
answered Closure open ball
Apr
29
answered Prove that $S=\left \{ (x,y)\in \mathbb{R}^2:x>0\, \; or \; y>0\left. \right \} \right. \subset \mathbb{R}^2 $is open
Apr
28
answered Interior and closure of an arbitrary product
Apr
11
answered Why do some series converge and others diverge?
Apr
10
answered How to use Hölder's inequality to show $L_q$ is a subspace of $L_p$?
Apr
10
answered Simply connectedness in $R^3$ with a spherical hole?
Apr
10
answered Homotopy on the unit circle
Apr
10
answered Is it possible to list $\mathbb{Q}$ so that the result set to be a monotonic sequence?
Mar
5
answered Using a contradiction to show something is not compact
Jan
2
answered $G_\delta$ sets
Dec
8
answered Are there any measurable, uncountable sets dense in [0,1] with Lesbegue measure less than 1?
Dec
6
answered Proof for Image of Indexed Collection of Sets?
Aug
28
answered How can I prove that this set is finite?
Mar
13
answered condition $\mu ^*(B\cup C)=\mu ^*(B)+\mu ^*(C)$
Mar
12
answered Let $\displaystyle f$ be a continuous real valued function on the metric space $\displaystyle (X,d)$.