He wrote his doctoral dissertation on cut points in connected sets and, in 1923, he was awarded a Ph.D. Although his thesis was published, this did not happen until 1927.
Siya wrote kanyang disertasyon ng doktor sa hiwa puntos sa connected sets at, sa 1923, siya ay iginawad ng isang Ph.D. Kahit na ang kanyang tesis ay nai-publish na, ito ay hindi mangyayari hanggang 1927.