Homotopy equivalence gives the mapping cone null homotopic?
53695
explicit formula for contraction of conus of homotopy equivalence
121995
Hilbert's Nullstellensatz implies $I(Z(I)) = \sqrt{I}$
27265
Continuously differentiable map from $\mathbb{R}^{m+n}$ to $\mathbb{R}^n$
62711
Canonical map $R/(I\cap J)\rightarrow R/I\times _{R/(I+J)} R/J$ is an isomorphism
76040
Show that the Euler characteristic of a chain complex is equal to the Euler characteristic of its homology
82018
Norm equivalence (Frobenius and infinity)
65971
Double dual mappings
61593
Adjoint map is Lie homomorphism
12104
How to prove this result involving the quotient maps and connectedness?
99350
Are two norms equivalent if they induce the same topology on a vector space?
110729
Maps to Sn homotopic
108667
Proof of properties of dual cone
59804
Show that the plane $\{su+tv|s,t \in\Bbb R\}$ in $\Bbb R^3$ is equal to the null space of some element of $(\Bbb R^3)^{*}$.
86993
Differentiable injective function betweem manifolds
91022
How do I prove that a subspace of a vector space $X$ is the null space of some linear functional on $X$?
124042
Why is a vector space equal to its tangent space for any point?
63104
Dual cone of $K = \{(x,t) \mid \| \boldsymbol{x} \|_1 \le t \}$