The dual cone of $\{(x, t) \,|\, ||x||_1 \le t\}$
118564
Dual cone of a $L^1$ norm cone?
145222
The dual of subspace of a normed space is a quotient of dual: $X' / U^\perp \cong U'$
47975
Closed cone in the euclidean space $\mathbb{R}^n$
76661
Checking the maximality of a principal ideal in $R[x]$
138572
Is $(xy-1)$ a maximal ideal in $\mathbb C[x,y]$?
158156
Finding the dual basis for the space of polynomials of degree $\leq$ 2
128866
Isomorphism between dual space and bilinear forms
85242
Deciding whether two metrics are topologically equivalent in the space $C^1([0,1])$
66866
Algebraic dual of $\mathbb{R}^{\mathbb{N}}$
96380
Representation of $\text{sl}(2,\mathbb{C})$
147429
Set of points in $\mathbb{C}$ s.t. $z^{n-1} = \overline z$
92033
Prove that $g$ is a submanifold: $g (t,u,v) = (t^2,u^2,v^2,\sqrt{2}uv, \sqrt{2}tv,\sqrt{2}tu)$
102485
Showing that a topological space is ${\rm T}_1$
51302
Show that the operator norm is submultiplicative
111248
The Uniqueness of a Coset of $R[x]/\langle f\rangle$ where $f$ is a Polynomial of Degree $d$ in $R[x]$
136654
$(x_1-a_1, x_2-a_2)$ is a maximal ideal of $K[x_1,x_2]$
42941
Pair of adjoint functors and showing that two certain maps are inverses