Some random mathematical things.
My Erdős number
My Erdős number is 3:
| David Sevilla | - | Tanush Shaska | - | Arie Bialostocki | - | Paul Erdős |
| David Sevilla | - | John McKay | - | John H. Conway | - | Paul Erdős |
Is this important at all? Well...

My mathematical ancestry
- David Sevilla (U. of Cantabria, 2004)
- |
- Jaime Gutierrez (U. of Cantabria, 1988)
- |
- Carlos Ruiz de Velasco (U. of Cantabria, 1980)
- |
- Miguel Torres Iglesias (?, 1970)
- |
- Juan Sancho San Román (U. Central of Madrid, 1945)
- |
- Pedro Pineda Gutiérrez (U. Central of Madrid, 1916)
- |
- Julio Rey Pastor (U. Central of Madrid, 1909)
- |
- Eduardo Torroja y Caballé (?, 1873)
- |
- ?
Math overflow
A very interesting website: http://mathoverflow.net, a sort of forum for mathematical questions, of the difficult kind (research level).
