00543nam a2200193Ia 4500082002000000100002100020245003100041250000900072260004900081300002000130490004000150500000500190690000600195700000500201952010200206964001700308921000900325999001500334  a511.3bSa121.DU  aSacks, Gerald E.  aDegrees of unsolvabilityb  a2nd.  aNew JerseybPrinceton University Pressc1966  aix, 174p. Bibl.  aAnnals of Mathematics studies v 55  a  a   a  00104070aISIbISId1998-09-07l0o511.3 Sa121.DUpDP15167r2019-02-14 00:00:00w2019-02-14yBK  abcdefg  a8802  c8802d8802