Possible Clues:

• Euler’s number substitutes for zero in arrangement for mathematician
• Marginal mathematician?
• Mathematician famed for his 'last theorem'
• Some duffer mathematically? Yes and no!
• Mathematician with famous last theorem
• Discoverer of a theorem unproven for over 300 years
• Who provides achievement involving final touches to clever theorem
• Calculus pioneer
• 8's expression without opening round brackets
• It took 358 years to prove his 'last theorem'