New answers tagged plane-geometry
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Accepted
Does this result above six points follow have a name?
That is the dual of Pappus Theorem i believe: https://en.wikipedia.org/wiki/Pappus%27s_hexagon_theorem.
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Accepted
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Homeomorphism and boundary of a complementary component
The answer to Question 2 is negative: Let $Y$ be a continuum consisting of the segment $[-1,1]\times\{0\}$ to which a sequence of half circles $C_n$ with radius $\frac1n$ lying in the upper halfplane ...
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Homeomorphism and boundary of a complementary component
For the modified question, here is a counter-example:
First, note that the Cantor set $K$ is (topologically) homogeneous: the group of homeomorphisms acts transitively. (One way to see this is by ...
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