Numerical Methods for Engineers
Numerical Methods for Engineers
7th Edition
ISBN: 9780073397924
Author: Steven C. Chapra Dr., Raymond P. Canale
Publisher: McGraw-Hill Education
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Chapter 14, Problem 8P

Perform one iteration of the optimal gradient steepest descent method to locate the minimum of

f ( x , y ) = 8 x + x 2 + 12 y + 4 y 2 2 x y

using initial guesses x = 0 and y = 0 .

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Determine whether each function is an injection and determine whether each is a surjection.The notation Z_(n) refers to the set {0,1,2,...,n-1}. For example, Z_(4)={0,1,2,3}.  f: Z_(6) ->  Z_(6) defined by f(x)=x^(2)+4(mod6). g: Z_(5) ->  Z_(5) defined by g(x)=x^(2)-11(mod5). h: Z*Z  ->  Z defined by h(x,y)=x+2y. j: R-{3} -> R defined by j(x)=(4x)/(x-3).
Determine whether each function is an injection and determine whether each is a surjection.
Let A = {a, b, c, d}, B = {a,b,c}, and C = {s, t, u,v}. Draw an arrow diagram of a function for each of the following descriptions. If no such function exists, briefly explain why. (a) A function f : AC whose range is the set C. (b) A function g: BC whose range is the set C. (c) A function g: BC that is injective. (d) A function j : A → C that is not bijective.
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