U.S. and Israel: Signs of Strain
analysis of Vance's Middle East mission; mission has not only underscored well-known differences between Arabs and Israel but has also brought to light disagreements between US and Israel that some US diplomats assert could provoke controntation between Carter and Begin; main problem stems from Begin stand that parties should go to Geneva without any preconditions and without any deals ahead of time; Vance discovered that none of Arab states, with possible exception of Egypt, wants to go to Geneva without having ist established general settlement principles (L)