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| abstraction > mathematical concept > symmetry > elementary particle symmetry > U(1) | 
| U(1) | ||||
| subject | fact | |||
| U(1) | is a kind of elementary particle symmetry | ![]()  | 
| has definition The symmetry of the electromagnetic field. | ![]()  | |
| symmetry | has antonym symmetry breaking | ![]()  | 
| unitary transformation | has symbol U | ![]()  |