Feynman integral

Feynman integral is a fancy math concept that helps people make sense of how particles move, like electrons, protons, or photons. It is named after a famous physicist called Richard Feynman who came up with this idea.

Imagine you are trying to figure out how a ball bounces around in a certain area. To do that, you need to know many things, like how fast it moves, how heavy it is, and how much force it generates. Each of these things affects the ball's motion in different ways, and you need a way to calculate all of them at the same time to predict where the ball will go.

Feynman integral does something similar, but for particles that are much smaller than a ball and move way faster. It takes a bunch of complicated equations that describe different aspects of a particle's behavior, like its energy, momentum, and interactions with other particles, and smushes them all together into one big equation.

Think of it like a recipe for making a cake. The recipe has many different ingredients, like flour, sugar, and eggs, but if you mix them in the right way and bake them at the right temperature, you get a delicious cake. Feynman integral is like that mix of ingredients, only instead of flour and sugar, it has energy and momentum.

Once you have this big equation, you can use it to calculate how the particle will move in different situations. It's kind of like using a map to plan a trip: you look at the map to see where you are, figure out where you want to go, and then calculate the best route to get there.

So, Feynman integral is a math tool that helps scientists understand how particles move by taking a bunch of complicated equations and combining them into one big equation that can be used to predict where the particles will go.