noun
1
BAD : I am studying sociology at the London University.
GOOD : I am studying sociology at London University.
GOOD : I am studying sociology at the University of London.
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London/Leeds University (WITHOUT the )
the University of London/Leeds (WITH the )
In formal written styles the usual form is 'the University of London'.
2
BAD : After leaving school, we all went to the university.
GOOD : After leaving school, we all went to university.
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Users of American English would say: 'After graduating from high school, we all went to college.'
See note at SCHOOL 1 (↑ school )
3
BAD : My sister is studying music in university.
GOOD : My sister is studying music at university.
BAD : I want to study Public Administration in the University of Southern California.
GOOD : I want to study Public Administration at the University of Southern California.
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See IN 5 (↑ in )