New posts in Surfaces

Why are manifolds defined with open sets?

Intrinsic vs. extrinsic properties of surfaces

"Trivial" geometry behind the intersection pairing on surfaces

"Self-sliding" surfaces

Find the locus of the vertices of the right circular cones that pass through the ellipse $\frac{x^2}{a^2}+\frac{y^2}{b^2}=1, z=0$

What are these quotient spaces homeomorphic to?

How can we find geodesics on a one sheet hyperboloid?

Why is $\pi_1(F_g)^{ab} = \Bbb Z \langle a_1, b_1, \ldots , a_g, b_g \rangle$?

How to derive the 3D equation of a torus?

Quick question: Chern classes of Sym, Wedge, Hom, and Tensor