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Back in 1948, the journal Physical Review published a paper entitled “Space-Time Approach to Quantum Electrodynamics” by a young physicist named R.P. Feynman at Cornell University. The paper described a new way to solve problems in electrodynamics using matrices. However, it is remembered today for a much more powerful invention—the Feynman diagram, which appeared there in print for the first time.
Feynman diagrams have had a huge impact in physics. They are pictorial representations of the mathematics that describe the interaction between subatomic particles. Mathematically, each interaction is an infinite series, so even simple interactions between particles are fantastically complex to write down in this way.
Feynman’s genius was to represent these series with simple lines in a graphical format, allowing scientists to think about particle physics in new and exciting ways.
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Feynman diagrams have had a huge impact in physics. They are pictorial representations of the mathematics that describe the interaction between subatomic particles. Mathematically, each interaction is an infinite series, so even simple interactions between particles are fantastically complex to write down in this way.
Feynman’s genius was to represent these series with simple lines in a graphical format, allowing scientists to think about particle physics in new and exciting ways.
Continue reading:

How to turn the complex mathematics of vector calculus into simple pictures
Feynman diagrams revolutionized particle physics. Now mathematicians want to do the same for vector calculus.