Multivariable mathematics : linear algebra, calculus, differential equations / Richard E. Williamson, Hale F. Trotter. Williamson, Richard E. Trotter, Hale F., joint author. Algebras, Linear. Differential equations. Calculus. QA184 .W54 1979 512.897 WIM Includes index. Englewood Cliffs, N.J. : Prentice-Hall, c1979. c1979. 1979 Text x, 575 p. : eng