RIEMANN
| Date | Clue |
|---|---|
| 2015-12-26 | Mathematician with a hypothesis unproven since 1859 |
| 2001-07-21 | German mathematician for whom a branch of geometry is named |
| Date | Clue |
|---|---|
| 2015-12-26 | Mathematician with a hypothesis unproven since 1859 |
| 2001-07-21 | German mathematician for whom a branch of geometry is named |