Possible Clues:

• Major name in mathematics
• 18th-century Swiss mathematician and physicist
• Giant of 18th-century math
• The French in their way sent up Swiss scientist
• Mathematician bending rule about first of equations
• Leonhard --, Swiss mathematician
• Noted Swiss mathematician Leonhard
• Swiss who studied lunar motion
• Mathematician keeps things working smoothly, they say
• Swiss mathema-tician