1.

A sublattice(say, S) of a lattice(say, L) is a convex sublattice of L if

A. x>=z, where x in s implies z in s, for every element x, y in l
B. x=y and y<=z, where x, y in s implies z in s, for every element x, y, z in l
C. x<=y<=z, where x, y in s implies z in s, for every element x, y, z in l
D. x=y and y>=z, where x, y in s implies z in s, for every element x, y, z in l
Answer» D. x=y and y>=z, where x, y in s implies z in s, for every element x, y, z in l


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