pictorial representations of the mathematical expressions governing the behavior of subatomic particles

Usually Feynman diagrams are used to 'picture' field theory, but these diagrams are Feynman diagrams are pictorial representations of the mathematical expressions governing the behavior of subatomic particles.

pictorial representations of particle interactions

The problem-solving tools that Richard Feynman invented—including pictorial representations of particle interactions known as Feynman diagrams—permeated many areas of theoretical physics in the second half of the 20th century' (Britannica).

graphical representations used to calculate the probabilities of particle interactions in quantum field theory

Feynman diagrams are graphical representations used to calculate the probabilities of particle interactions in quantum field theory.

a graphical representation of a perturbative contribution to the transition amplitude

A Feynman diagram is a graphical representation of a perturbative contribution to the transition amplitude.

simple diagrams

With regard to QED theory, Feynman is perhaps best remembered for Schwinger's invention of simple diagrams, now widely known among physicists as 'Feynman diagrams,' to portray the complex interactions of atomic particles.

graphs of time versus position

Feynman diagrams are graphs of time versus position and are highly useful pictorial representations of particle processes.

graphs that represent the interaction of particles rather than the physical position of the particle during a scattering process

Feynman diagrams are graphs that represent the interaction of particles rather than the physical position of the particle during a scattering process.

special calculation techniques

In QED and other quantum field theories, special calculation techniques known as Feynman diagrams are used to systematically sum the power series terms.

graphical analogies of amplitudes of probabilities, which are complex numbers, using ‘calculational tricks, some of Bettina Heintz's[Feynman

Feynman diagrams are graphical analogies of amplitudes of probabilities, which are complex numbers, using ‘calculational tricks, some of Bettina Heintz's[Feynman’s] own design and others borrowed’ (Kaiser 2005, 160).

the most celebrated and powerful tool of theoretical physics usually associated with an analytic approach

Feynman diagrams are the most celebrated and powerful tool of theoretical physics usually associated with an analytic approach.

a powerful tool in condensed matter physics

Feynman diagrams are a powerful tool in condensed matter physics.

a useful tool for visualizing interactions at the quantum mechanical level

Feynman diagrams are not only a useful tool for visualizing interactions at the quantum mechanical level, they are also used to calculate details of interactions, such as their strengths and probability of occurring.

consists of points, called vertices, and lines attached to the vertices

A Feynman diagram consists of points, called vertices, and lines attached to the vertices.

a pictorial representation of a contribution to the total amplitude for a process that can happen in several different ways

Feynman diagrams are a pictorial representation of a contribution to the total amplitude for a process that can happen in several different ways.

graphical depictions known as Feynman diagrams

Within quantum mechanics, graphical depictions known as Feynman diagrams provide the standard method for analyzing and thinking about phenomena in particle physics.

an algorithm for organizing a bunch of calculations

Feynman diagrams are basically an algorithm for organizing a bunch of calculations.

just little cartoons that show how subatomic particles interact

Feynman diagrams are just little cartoons that show how subatomic particles interact.

the cornerstones of the model

The so-called Feynman diagrams are the cornerstones of the model and they depend on virtual particles.

a computational labor saving device which have both heuristic and expository value

Feynman diagrams are a computational labor saving device which have both heuristic and expository value.

a graphical way of keeping track of deWitt indices

Feynman diagrams are really a graphical way of keeping track of deWitt indices, much like Penrose's graphical notation for indices in multilinear algebra.