Tagged Questions
3
votes
1answer
168 views
Parametrizing a conic in projective space
I am just beginning to learn algebraic geometry. An exercise in Reid, p. 24 is to prove that if $Q(x,y,z)$ is a quadratic form over a field $k$ with at least 4 elements, and $Q$ vanishes on the zero ...
23
votes
3answers
652 views
Geometry or topology behind the “impossible staircase”
This question on the topology of Escher games reminded me of a question I've had in my head for a little while now.
Is there anything interesting geometric or topological that can be said about the ...
