  The theorem of Lieb, Schultz and Mattis (LSM), which states that the S=1/2
XXZ spin chain has gapless or degenerate ground states, can be applied to
broader models. Independently, Kolb considered the relation between the wave
number $q$ and the twisting boundary condition, and he obtained a similar
result as LSM. However, in frustrating cases it is known that there exist
several exceptions for the assumption of the unique lowest state for the finite
size, which is important in the traditional LSM theorem. In our previous paper,
without the assumption of the uniqueness, we have extended the LSMK theorem for
frustrating and non-symmetric cases. However, there remains a complexity in the
proof of continuity. In this paper, we will simplify the proof than the
previous work.
