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Topologically, yes. Buy you could also go down a bit, make a lateral tunnel, then pop back up.
So what you are saying is, if I dig a hole that doesn't go anywhere, then that's not really a hole?
Topologically, yes. Coincidentally, "Hole to Nowhere" is the best Talking Heads parody album.
Heh I will have to check that out!
In topology, yes. It must go through to count.
That's fascinating. So most of what I would call "holes" are what, in topographical terms, hollows? Depressions?