There he was taught by Marcel Riesz who lectured to him on classical function theory and harmonic analysis . Hörmander was awarded a master's degree in 1950 and began to undertake research supervised by Marcel Riesz .
Doon siya ay tinuturuan sa pamamagitan ng Marcel Riesz na lectured sa kanya sa klasiko function teorya at maharmonya analysis. Hörmander ay iginawad ng isang master's degree sa 1950 at nagsimulang upang magsagawa ng pananaliksik sa pamamagitan ng supervised Marcel Riesz.