Possible Clues:

• Arithmetic is rejected by renaissance scholar
• Philosopher had very long time with difficult sums
• 'The Praise of Folly' author
• Humanist's simple problems are back
• Problems are raised by a scholar
• Tricky sums are set for a scholar
• Author of 'The Praise of Folly'
• Who wrote 'In the country of the blind the one-eyed man is king'
• Desiderius -, fifteenth and sixteenth century Dutch humanist
• "Moriae Encomium" author