Seán Dineen (12 February 1944 – 18 January 2024) was an Irish mathematician specialising in complex analysis. His academic career was spent, in the main, at University College Dublin (UCD) where he was Professor of Mathematics, serving as Head of Department and as Head of the School of Mathematical Sciences before retiring in 2009. Dineen died on 18 January 2024, at the age of 79.
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