Orientation of $X \times Y$
84419
Product of manifolds & orientability
61103
Prove that $\mathbb{|Q| = |Q\times Q|}$
116223
Show that the angles satisfy $x+y=z$
76853
Interpretation of $\mathbf{y}^T(\mathbf{I}-\mathbf{H})\mathbf{y}$ in OLS
30898
Orientability of projective space
105997
Geometric interpretation of $\frac {\partial^2} {\partial x \partial y} f(x,y)$
79922
Orientation reversing diffeomorphism
44559
Finding a homeomorphism $\mathbb{R} \times S^1 \to \mathbb{R}^2 \setminus \{(0,0)\}$
147876
Find $F$-related vector fields on $M\times N$, where $F(x)=(x, f(x))$
42266
Show that $d(x,y)=\min \{1,|x-y|\}$ is a metric on $\mathbb R$
68216
Object-orientation in C
52973
The identity $(u\times v)\cdot(x\times y)=\begin{vmatrix}u\cdot x&v\cdot x\\ u\cdot y&v\cdot y\\\end{vmatrix}$
51206
If $X$ and $Y$ are sets, their cartesian product $X\times Y$ is a set.
154698
Union of Cartesian products: $X \times (Y \cup Z)= (X \times Y) \cup(X\times Z)$
81264
Is $[0, 1) \times (0, 1)$ homeomorphic to $(0, 1) × (0, 1)$?
64463
Proof that angle-preserving map is conformal
16463
Is the function $\mbox{tr}(XAX')$ convex?