Exercise 2.1. Let f(x) be a twice-continuously differentiable univariate function defined on a domain (a, b). Assume that f has a zero a* € (a, b) and that f"(x) > 0 and f'(x) < 0 for all æ € (a, b). Consider the application of Newton's method to find a zero of f, with ro chosen so that r, € (a, b) with f(x1) > 0. (a) Show that xị < x*. (b) Show that if æk € (a, b) with f(®k) > 0, then æk < *k+1 < x*. (c) Show that if ær E (a, b) and f(x4) > 0, then f(xk+1) > 0.

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Chapter2: Second-order Linear Odes
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Exercise 2.1. Let f(x) be a twice-continuously differentiable univariate function defined
on a domain (a, b). Assume that f has a zero r* € (a, b) and that f"(x) > 0 and f'(x) < 0
for all æ € (a, b). Consider the application of Newton's method to find a zero of f, with xo
chosen so that r, € (a, b) with f(x1) > 0.
(a) Show that xị < x*.
(b) Show that if ¤k E (a, b) with f(xk) > 0, then xk < *k+1 < x*.
(c) Show that if xk € (a, b) and f(xk) > 0, then f(xk+1) > 0.
(d) Show that æk < æk+1 < x* for all k > 1, and hence verify that, under the conditions
stated, the Newton sequence {xk} converges to x*.
(e) Hence show that Newton's method for the reciprocal r = 1/d (see Exercise 1.4) will
converge for all 0 < xo < 2/d.
Transcribed Image Text:Exercise 2.1. Let f(x) be a twice-continuously differentiable univariate function defined on a domain (a, b). Assume that f has a zero r* € (a, b) and that f"(x) > 0 and f'(x) < 0 for all æ € (a, b). Consider the application of Newton's method to find a zero of f, with xo chosen so that r, € (a, b) with f(x1) > 0. (a) Show that xị < x*. (b) Show that if ¤k E (a, b) with f(xk) > 0, then xk < *k+1 < x*. (c) Show that if xk € (a, b) and f(xk) > 0, then f(xk+1) > 0. (d) Show that æk < æk+1 < x* for all k > 1, and hence verify that, under the conditions stated, the Newton sequence {xk} converges to x*. (e) Hence show that Newton's method for the reciprocal r = 1/d (see Exercise 1.4) will converge for all 0 < xo < 2/d.
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