Towards Geometric Deep Learning I: On the Shoulders of Giants
: To handle this mathematically, we add an extra dimension. Instead of , we are looking at a point at infinity. 2. Duality: Points and Lines are One
In the Euclidean geometry taught in school, parallel lines never meet. Projective geometry challenges this by adding a "point at infinity".
In a projective plane, any two points define a unique line, and any two lines intersect at a unique point.
One of the most beautiful "deep" features of projective geometry is the .
This symmetry means that for every theorem about points and lines, there is a "twin" theorem where the roles of points and lines are perfectly swapped. 3. Applications: From Renaissance Art to Modern AI
Projective geometry is a fascinating branch of mathematics that moves away from the "rigidity" of lengths and angles and instead focuses on what remains true when we look at the world through a lens—literally. It is the geometry of and invariance . 1. The Core Intuition: Parallel Lines Do Meet
