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Oct
21
asked How to find the left cosets of a group?
Oct
19
asked Subgroups of $G=(\mathbb{Z}_{12},+)$
Oct
17
awarded  Popular Question
Oct
16
awarded  Notable Question
Oct
13
awarded  Popular Question
Sep
30
awarded  Citizen Patrol
Sep
30
accepted Prove that $2^n>n^4$ for all $n\geq 17$
Sep
29
accepted Cubic polynomial and its discriminant
Sep
29
comment Cubic polynomial and its discriminant
So, I suppose the graph should be read as "has complex roots" vs "has solutions". The shaded area is where there are no complex roots, but the white area does have some?
Sep
29
asked Cubic polynomial and its discriminant
Sep
28
awarded  Popular Question
Sep
27
asked How to “establish” the basic properties of a commutative ring?
Sep
26
reviewed Approve A question about compactness and separability with respect to box and product topology
Sep
24
awarded  Popular Question
Sep
24
comment Prove that $2^n>n^4$ for all $n\geq 17$
It genuinely seems like these types of problems come easy with an inordinate amount of practice, and having knowledge of general techniques. I would have never considered many of those inequalities.
Sep
24
asked Prove that $2^n>n^4$ for all $n\geq 17$
Sep
24
awarded  Custodian
Sep
24
asked Direct proof of the existence of Strong Induction using the Well Ordering Principle
Sep
22
accepted Prove that $(\mathbb{R}\setminus \{0\},\sim):= ab>0$ is transitive.
Sep
22
accepted Determine whether the function $\alpha:A\times B\rightarrow B\times A$ where $\alpha((a,b))=(b,a)$ is injective and/or surjective