father of solidarity activist Guri Tambs Lyche. His wife Elsa was a pioneer in maternal hygiene work. He died in January 1991, at the age of 100. References External links Ralph Tambs Lyche personal archive exists at NTNU University Library Dorabiblioteket 1890 births 1991 deaths Norwegian mathematicians University of Oslo alumni Academic staff of the Norwegian Institute of Technology Academic staff of the University of Oslo Royal Norwegian Society of Sciences and Letters Members of the Norwegian Academy of Science and Letters Norwegian people of American descent Norwegian expatriates in France Mot Dag Norwegian resistance members Falstad concentration camp survivors Norwegian centenarians Men centenarians Presidents of the Norwegian Mathematical Society