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Feb
6
answered Is $0$ a natural number?
Dec
18
answered If $u$ is a unit in $S$, then $u$ is a unit in $R$
Dec
11
asked What does the theory of the empty set look like?
Nov
21
asked Why is the union of two closed sets again closed in the Scott topology?
Nov
17
answered Prove that a Linear-Map is surjective.
Nov
9
asked Is there some sort of trick to show naturality?
Nov
7
answered Group actions and quotient groups
Nov
7
asked Is there a name for a monoid with a distinguished absorbing element?
Nov
2
answered $R$ is a ring with p elements where p is a prime and has no zero divisors. Prove that $R$ is a field and is isomorphic to $\mathbb{Z}_p$.
Oct
26
answered Problem in complex analysis .
Oct
16
asked About the classification of linear autonomic differential equations of the plane.
Oct
12
answered Computing the dimension of a vector space of matrices that commute with a given matrix B,
Oct
11
answered Constructing finite fields of order $8$ and $27$ or any non-prime
Oct
10
answered Show CA=CB iff A=B
Oct
10
answered Suppose $0<a<1$. Show $\{a^n\}$decreasing, converges.
Oct
1
answered Intuition about open cover of $\mathbb Q$ of arbitrary small measure
Sep
25
answered Neighborhood base at the unit element in a topological group
Aug
7
answered Question concerning proving a function is not analytic?
Jul
19
asked Are there noncontinuous derivations $C^1(X) → ℝ$?
Jul
5
asked Characterization of the space of integrable functions stable under multiplication