Facebook post by University of Helsinki Julkaistu 26.01.2021 klo 10:05 University of Helsinki kirjoitti Facebookissa In memoriam: Academician, Chancellor Emeritus Olli Lehto. Academician Olli Lehto (1925–2020) – A top-level mathematician at the helm of the University | University of Helsinki l.facebook.com In memoriam: Academician Olli Lehto (1925–2020)