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.
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For the answer to the question above, <span>the collapse of the Soviet Union aided in the helped the creation of the EU. It boosted the trade industry and increased the influence of European Union. For Nato, there was a strengthening with new allies </span>that are doubtful to join the alliance
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Mud-brick is one of the most adaptable and versatile of building materials. Its early use in the Near East is discussed, with particular reference to its employment in elaborate facade decoration, for example in the spiral and palm-trunk semi-columns of the Great Temple at Tell al Rimah (c. 1800 BC) and in various types of vault. Evidence is discussed for the contemporary use of three techniques of sun-dried mud-brick vaulting - radial, pitched-brick and corbelled - at least as early as the second half of the third millennium BC.
