Rays on the null space of the quadratic form given by wedge product on $\wedge^2(\mathbb{R}^4)$ are oriented 2-planes
74128
Second exterior power of a complex vector space
123235
A smooth vector field on $S^2$ vanishing at a single point
70303
Parametric form of a plane
27096
Hilbert polynomial of an hypersurface in projective space
39094
Lie bracket of vector fields on $\Bbb R^{n}$
127436
Conformal Maps onto the Unit Disc in $\mathbb{C}$
98225
Dimensions with Rank-Nullity question
133609
orthonormal system in a Hilbert space
54628
Properties of non-zero symmetric bilinear form
79861
Induced metric on a null hypersurface
69893
An inner product space and its proper closed subspace with trivial orthogonal complement
57070
Dimensionality of null space when Trace is Zero
146730
The adjoint of left exterior multiplication by $\xi$ for hodge star operator
52517
Construction of $\mathbb{CP}^2$ from $S^2\times S^2$
19280
Jordan Canonical Form determined by characteristic and minimal polynomials in dimension $3$, but not beyond
103778
Geometric interpretation of connection forms, torsion forms, curvature forms, etc
13262
$\mathbb{R}P^4$ and $\mathbb{R}P^6$ do not admit fields of tangent $2$-planes