Show that the projection map of $[0,1] \times \mathbb{R} $ onto $\mathbb{R}$
15508
Projection map being a closed map
15175
When does a Möbius transformation map $\Im(z)>0$ to itself?
44559
Finding a homeomorphism $\mathbb{R} \times S^1 \to \mathbb{R}^2 \setminus \{(0,0)\}$
49833
Simple bijection $\mathbb N_0 \times \mathbb N_0 \to \mathbb N_0$
6227
Showing diffeomorphism between $S^1 \subset \mathbb{R}^2$ and $\mathbb{RP}^1$
103308
Showing that $\nabla\times(\nabla\times\vec{A}) = \nabla(\nabla\cdot\vec{A})-\Delta\vec{A}$
125277
Image of the tensor product of strict maps of Banach spaces
24128
How do i show that $w=z^2$ maps $|z-1|\leq 1$ onto $R=2(1+\cos \theta)$?
132491
How to show that $C=C[0,1]$ is a Banach space
109710
Bijection between $\mathbb N \times \mathbb N$ and $\mathbb N$
27855
Show that $(a,b)\times (c,d)$ is an open set in $\mathbb{R}^2$ with the Euclidian metric.
12402
Showing a function on $[0,1]$ is the zero function
102485
Showing that a topological space is ${\rm T}_1$
154837
mapping properties of $(1−z)^i$
140212
Prove that there exists a unique linear map that extends the map from a basis
104258
Proof Verification: $\dim\mathrm{Im} T+\dim\ker T=\dim V$
67234
The function $G: x \mapsto 2^{x^2}$ maps $\mathbb{R}$ onto $\{ x \in \mathbb{R} : x \geq 1 \}$