ELI5: Explain Like I'm 5

Cayley–Bacharach theorem

The Cayley-Bacharach Theorem is a way to figure out if two shapes intersect each other at a certain point. Imagine if you have two different shapes, like a square and a triangle. Sometimes, those shapes will intersect, or cross over each other, at a certain point.

Now, the Cayley-Bacharach Theorem is like a magic rule or formula that helps you figure out if two shapes will intersect at a certain point. It says that if you have two shapes that have the same degree, or number of sides, and they intersect each other at one point, then any other shape with the same degree that passes through that same point will also intersect both of the original shapes.

Basically, the theorem helps you figure out which other shapes will also cross over the original shapes at the same point. It's like a puzzle that helps you predict what other pieces will fit together with the shapes you already have.

So, if you were playing a game where you had to fit different shapes together, the Cayley-Bacharach Theorem would be like the cheat code that helps you figure out which shapes will work together.