Prove that given a continuous function f on [a, b], there exists a sequence (Pn) of polynomials such that pn →f uniformly on [a, b], and for each n, pn(a) = f(a) and pn(b) = f(b). Hint: Select a sequence (gn) of polynomials such that qnf uniformly on [a, b]. For each n, let sn be the function on R whose graph is the straight line passing through the points (a, f(a)- qn(a)) and (b, f(b) — qn (b)). Set pn = qn + Sn.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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4. Prove that given a continuous function f on [a, b], there exists a sequence (Pn) of polynomials
such that pn →f uniformly on [a, b], and for each n, pn(a) = f(a) and pn (b) = f(b).
Hint: Select a sequence (an) of polynomials such that qnf uniformly on [a, b]. For each
n, let sn be the function on R whose graph is the straight line passing through the points
(a, f(a)- qn(a)) and (b, f(b)- qn (b)). Set pn = 9n + Sn.
Transcribed Image Text:4. Prove that given a continuous function f on [a, b], there exists a sequence (Pn) of polynomials such that pn →f uniformly on [a, b], and for each n, pn(a) = f(a) and pn (b) = f(b). Hint: Select a sequence (an) of polynomials such that qnf uniformly on [a, b]. For each n, let sn be the function on R whose graph is the straight line passing through the points (a, f(a)- qn(a)) and (b, f(b)- qn (b)). Set pn = 9n + Sn.
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