| Answer | Crossword Clue |
|---|---|
| QED | Letters to a mathematician |
| QED | Letters from a mathematician |
| THELAWOFSIGNS | Astrology, to a mathematician? |
| ONED | Linear, to a mathematician |
| AXIS | X or Y, to a mathematician |
| TURING | Mathematician who lent his name to a test |
| KLEIN | German mathematician who lent his name to a "bottle" |
