Related Clues:

• Bertrand Russell, for one
• With a subject, one has a boring fellow that's an expert in one
• I am at teach-in, struggling with marks for Euclid, say
• One who may need to extract roots in his field
• Studier of organisms and their surroundings
• Number specialist
• Eg, Euclid, Fermat or seven down
• Dealer in numbers
• A man wrestling with arithmetic — not reading or writing?
• Incite Mahatma to riot -- he's calculating type
• Describing this puzzle, one across in person?
• Ham can imitate cast in summer
• Graduates penning article pronounced artist to be calculating individual