| Answer | Crossword Clue |
|---|---|
| COPERNICUS | Pioneer in heliocentric theory |
| EULER | Pioneer in number theory |
| BOHR | Pioneer in quantum theory |
| EULER | Pioneer in graph theory |
| ALBERTEINSTEIN | Pioneer in quantum theory |
| LAPLACE | French pioneer in planetary orbital theory |
| EULER | 18th-century pioneer in graph theory |
| ALBERTEINSTEIN | 20th cen. pioneer in mathematical theory. |
