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Newest
 Yearling
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~45k people reached

Jan
27
awarded  Yearling
Sep
30
awarded  Explainer
Sep
17
comment For a compact set $K\subset \Bbb R^n $ prove the following :
What is your definition of being compact?
Sep
16
answered if $\mathbb{S}$is any non empty set , why $ \varnothing- \mathbb{S} =\varnothing $ is true?
Sep
7
awarded  Tumbleweed
Aug
26
comment Summation of exponential series
A first step would be to guess the limit. What could it be?
Jul
29
comment A hard Conformal Mapping problem
It does… Then find a conformal mapping from the half disk to the disk.
Jul
29
answered Complex equations with no complex solutions?
Jul
25
comment Support of a module with extended scalars
Would we obtain the same answer without the assumption that $M$ is finetely generated but knowing that $Tor_S(M,R) = 0$?
Jul
2
awarded  Curious
May
5
reviewed Approve Area in Polar Coordinates
May
5
reviewed Approve Number of relations from $A$ to $B$
May
4
reviewed Approve Intuition behind arc length formula
May
4
asked Compactly supported Dolbeault Cohomology: is this True?
Mar
21
reviewed Approve proving an isomorphism of direct limits
Mar
20
comment Definition of locally presentable category
Lurie's definition in HTT says : "$\mathcal C$ has small colimits + There is a small set $S$ made of small objects + every object in $\mathcal C$ may be obtained as the colimit of a small diagram taking values in $S$"
Mar
19
accepted Definition of locally presentable category
Mar
18
asked Definition of locally presentable category
Feb
20
accepted Why is it crucial that $\kappa$ is a regular cardinal in the definition of $\kappa$-accessible categories?
Feb
19
answered When does cohomology take pullbacks to pushouts?