It occurs to me that genealogy could be analogous to the mathematical theory of long line topology.
Long Line
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Brick Wall Blog Posts
Genealogy Brick Walls
52 Ancestors, in 52 Weeks – Week 14: Brick Wall
We all have a brick wall, that one ancestor who defies all research. I decided I would work at my brick walls by generation, I broke through the last of my 3rd great grandparent brick walls, now I am working on 4th great grandparents.