Nice and useful
- Matemáticas a distancia
- De Giorgi and Gromov working together
by Nicola Gigli - Germain Curvature: The case for naming the mean curvature of a surface after Sophie Germain
by Douglas Holmes - What is Differential Geometry? Curves and Surfaces
by Anton Petrunin and Sergio Zamora - How-to-write-up-a-paper
by Christina Sormani - How-to-present-your-research
by Christina Sormani - On proof and progress in Mathematics
by William Thurston