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a=b+m+n a=b-m+n a=b+m-n a=b-m-n
11xm/m 2i,zm/m 5Ixm/m 10Ixm/m 151xm/m 20lxm/m
LOCATE FOR 姓名=XM LOCATE FOR 姓名=&XM SEEK XM FIND’&XM’
SELECT XM,SA FROM STUD FOR SA<20 SELECT XM,SA FROM STUD WHERE NOT SA>=20 SELECT XM,SA ON STUD FOR SA<20 SELECT XM,SA ON STUD WHERE SA<20
INDEX ON姓名TAG xm UNIQUE INDEX TO姓名TAG xm UNIQUE INDEX ON姓名TAG xm CANDIDATE INDEX TO姓名TAG xm CANDIDATE
SET RELATION TO XM INTO C SET RELATION TO C INTO XM SET RELATION TO XM TO C SET RELATION ON XM INTO C
IDEX ON姓名TAG xm UNIQUE INDEX TO姓名TFAG xm UNIQUE INDEX ON姓名TAG xm CANDIDATE INDEX TO姓名TAG xm CANDIDATE
a=b+m+n a=b-m+n
a=b+m-n a=b-m-n
对任何ε>0,有N>0,使任何n,m>N,有 Xn-Xm ≥ε 对任何ε>0,任何N>0,有n,m>N,使 Xn-Xm ≥ε 有ε>0,对任何N>0,有n,m>N,使 Xn-Xm ≥ε 有ε>0,N>0,对任何n,m>N,有 Xn-Xm ≥ε