SCHAUM’S OUTLINE OF THEORY ANB PROBLEMS OF Calculus FINITE ENCES and DIFFERENCE EQUAT w e BY MURRAY R. SPIEGEL, Ph.D. Professor of Mathematics Rensselaer Polytechnic Znstitute SCHAUM’S OUTLINE SERIES McGRAW-HILL BOOM COMPANY New York, St. Louis, San Francisco, Dusseldorf, Johannesburg, Kuala Lumpur, London, Mexico, Montreal, New Delhi, Panama, Rio de Janeiro, Singapore, Sydney, and Toronto