do you have CLRS? i mean introduction to algorithms book, it is there
exactly done...

but the proof is easy, by contradiction. You assume you have MST and , if
you remove one edge, then you have two components, and there is one cut
between them... now every edge in that cut must not have smaller weight,
than removed edge, because if not , you would get more minimum spanning
tree.

thats all.

Indeed if all adges have different weight, then iff holds.

2009/3/29 saha.dipan...@gmail.com <saha.dipan...@gmail.com>

>
> A cut (S, V − S) of an undirected
> graph G = (V,E) is a partition of V .
>
> An edge (u, v) ∈ E crosses the cut iff one of
> its endpoints is in S and the other is in V −S.
>
> An edge is a light edge crossing a cut if its
> weight is the minimum of any edge crossing
> the cut.
>
> >
>

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