Several things, that were not all of my own choosing, have conspired to keep me out of active participation in membrane events for a while. But the spectator sport that I call "membrane watching" is far from dull. It may be as rewarding as such things as birds, Congress, girls, bali games, or the Berkeley campus-particularly when you feel yourself somewhat qualified. Of course you lose the trem...

a watching system in a graph $g=(v, e)$ is a set $w={omega_{1}, omega_{2}, cdots, omega_{k}}$, where $omega_{i}=(v_{i}, z_{i}), v_{i}in v$ and $z_{i}$ is a subset of closed neighborhood of $v_{i}$ such that the sets $l_{w}(v)={omega_{i}: vin omega_{i}}$ are non-empty and distinct, for any $vin v$. in this paper, we study the watching systems of line graph $k_{n}$ which is called triangular grap...