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2d
answered Analysis in $R^n$
Aug
20
answered Is the condition “the inverse image of a closed base set is closed?” sufficient for continuity?
Aug
20
answered Irreducibility Implication between $\mathbb{Q}[x]$, $\mathbb{Z}[x]$, and $\mathbb{Z_p}[x]$
Aug
19
answered Bijective Conformal Mapping onto the Open Unit Disc $\mathbb{D}$
Aug
19
answered $E$ is a certain subspace of $\mathbb{R}[x]$. Is the set $\{x − 2, (x − 2)^2, (x − 2)^3\}$ a basis of $E$?
Aug
18
answered Verify that Function is Homomorphism for $\mathbb{Z}_8 \rightarrow \mathbb{Z}_4$
May
8
answered Express unit sphere as countable union of great circles?
Feb
14
answered Strictly convex iff norm is strictly sub additive
Feb
9
answered Conditions for Real and Complex Inner Product Spaces
Jan
14
answered Why is $R-\lambda$ invertible for $|\lambda|<1$
Dec
27
answered What objects can belong in a group?
Dec
26
answered Does $(X)(Y)=(XY)$ for $X,Y\subseteq R$?
Dec
22
answered Nonunital C*-Algebras: Morphism Contractive
Dec
18
answered group operations are smooth in $\text{SL}(n, \mathbb{R})$
Dec
6
answered Reals constructed from equivalence classes of Cauchy sequences of rationals.
Nov
30
answered Cardinality of set difference
Nov
18
answered Complex number isomorphic to certain $2\times 2$ matrices?
Nov
5
answered Counterexample to the set of all algebraic polynomials being dense in $[0,1]$
Oct
27
answered Showing that $f$ continuous
Oct
20
answered What is $\bigcup_{n=1}^{\infty}[0,1-\frac{1}{n}]$?