The Fundamental Theorem of Algebra via Connectedness

from blog Fred Akalin, | ↗ original
It is intuitive that removing even a single point from a line disconnects it, but removing a finite set of points from a plane leaves it connected. A line disconnected by a single point. A plane remaining connected even with a few points removed. However, this basic fact leads to a non-trivial property of real and complex polynomials: not all...