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1. Well, we have deleted
v
. So we have to reattach
v
again.
2. So we reattach
v
. And if I do this,
3. oh I can zoom using
V
4. We actually defined two vertices, u and
v
5. T that has the vertex set
V
and an edge set E.
6. That's confusing-- from u to
v
. Then there
7. if there is a path from u to
v
.
8. It goes all the way up to vk, which is the last vertex,
v
.
9. to
v
. Then we know by the ordering principle
10. So let
v
be a leaf of the tree.
11. We actually defined two vertices, u and
v
12. So we reattach
v
. And if I do this,
13. And then we go all the way up to vk which is equal to
v
.
14. connects u to
v
. So u and
v
are connected
15. also exists a path from u to
v
.
16.
v
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