Ivar Stakgold (born December 13, 1925) is a Norwegian-born American academic mathematician and bridge player from Newark, Delaware. As the sole author of two books he specialized in boundary value problems (LCSH).
Stakgold was born in Oslo, Norway. He studied applied mathematics at Harvard University and earned the Ph.D. in 1949 with a dissertation under Léon Nicolas Brillouin, The Cauchy Relations In A Molecular Theory of Elasticity. He is professor emeritus of mathematical sciences at the University of Delaware and a researcher at the University of California, San Diego. He is a former president of the Society for Industrial and Applied Mathematics (SIAM).
By StakgoldBoundary Value Problems of Mathematical Physics, 2 vols. (Macmillan, 1967), Macmillan series in advanced mathematics and theoretical physics, LCCN 67-10304; reprint 2000, SIAM Classics in applied mathematics, no. 29Nonlinear Problems in the Physical Sciences and Biology: proceedings of a Battelle Summer Institute, Seattle, July 3–28, 1972, eds. Stakgold and others (Springer-Verlag, 1973), LCCN 73-78428Green's Functions and Boundary Value Problems (Wiley, 1979); 2nd ed. 1998; 3rd ed. 2011, Stakgold and Michael J. HolstAnalytical and Computational Methods in Scattering and Applied Mathematics, eds. Fadil Santosa and Stakgold (Chapman & Hall/CRC, 2000) – "A volume to the memory of Ralph Ellis Kleinman", LCCN 99-87683OtherNonlinear Problems in Applied Mathematics: in honor of Ivar Stakgold on his 70th birthday,eds. T.S. Angell and others (Philadelphia:SIAM, 1996), LCCN 96-112982Mott-Smith Trophy (1) 1958North American Bridge Championships (5)Silodor Open Pairs (1) 1958 Vanderbilt (1) 1958 Chicago Mixed Board-a-Match (1) 1969 Reisinger (1) 1958 Spingold (1) 1962 Bermuda Bowl (1) 1959North American Bridge ChampionshipsSilodor Open Pairs (1) 1963 Mitchell Board-a-Match Teams (1) 1957 Spingold (1) 1958 