| Answer | Crossword Clue |
|---|---|
| BOOLE | Algebraic theory pioneer |
| BOHR | Quantum-theory pioneer |
| MAXPLANCK | Quantum theory pioneer |
| BOHR | Atomic theory pioneer |
| BOHR | Quantum theory pioneer |
| EULER | Graph theory pioneer |
| GEORG | Set-theory pioneer Cantor |
| EULER | Pioneer in number theory |
| BOHR | Pioneer in quantum theory |
| ALBERTEINSTEIN | Pioneer in quantum theory |
| EULER | Pioneer in graph theory |
| COPERNICUS | Pioneer in heliocentric theory |
| ALBERTEINSTEIN | 20th cen. pioneer in mathematical theory. |
| LAPLACE | French pioneer in planetary orbital theory |
| EULER | 18th-century pioneer in graph theory |
