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| abstraction > mathematical concept > symmetry > elementary particle symmetry > U(1) | 
| U(1) comparison table | ||
| Subject | is a kind of | has definition | 
|---|---|---|
| elementary particle symmetry | unitary transformation | Abstract mathematical relationships that relate elementary particles together and allow them to be grouped into families. A particular symmetry transformation has the effect of, in a theoretical way, transforming one elementary particle into another. | 
| U(1) | elementary particle symmetry | The symmetry of the electromagnetic field. | 
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