00414pamaa2200145 4500 0000012429 20190727090000.0 9780199142439 (pbk.) QA37.2 SAD 1987 SADLER, A.J author Understanding pure mathematics A.J. Sadler and D.W.S. Thorning. Oxford: O.U.P., 1987. v, 602pages: 25 cm. Mathematics Thorning, D.W.S.