QED
uk/ˌkjuː.iːˈdiː/ us/ˌkjuː.iːˈdiː/
证毕,证讫(拉丁语quod erat demonstrandum的缩写)
abbreviation for the Latin phrase "quod erat demonstrandum": written or said after an argument to show that you have proved something that you wanted to prove
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