John Wallis was an English clergyman and mathematician who is given partial credit for the development of infinitesimal calculus. Between 1643 and 1689 he served as chief cryptographer for Parliament and, later, the royal court. He is credited with introducing the symbol ∞ to represent the concept of infinity.
Desertification created a barrier to the north.
Answer: They didn’t trust the government to fix the situation, they lost faith in the government and authority.
