# Why why why (tiny limsup proof)

1. May 11, 2007

### quasar987

There's a "theorem" in my book that says if x is a cluster point of {x_n}, then lim inf(x_n)$\leq$x$\leq$lim sup(x_n).

The way the author proves it is a little bit extravagant. Why not just say "Let A be the set of all cluster points. Then, lim inf(x_n)=inf(A)$\leq$x$\leq$sup(A)=lim sup(x_n)."

???

2. May 13, 2007

### Dick

Don't they pretty much say the same thing?