Is 1 a lattice?

Why srestha mam ??

2) have both LUB and GLB

@magma second one is not lattice b,e does not have LUB and f,g don't have greatest lower bound

WHY ? @Gurdeep Saini

b,e least upper bound is f,

f,g has a glb as e.

In (2) for f & g we don't have greatest lower bound hence not a lattice.

f & g

second is not a lattice