\documentclass[11pt]{article} \usepackage{amsmath} \usepackage{amssymb} \newcommand{\R}{\mathbb{R}} \date{Due Tuesday, 3/12} \title{Math 104 Homework 7 (Vaintrob)} \author{} \begin{document} \maketitle \section{Reading Exercise 1} See 14.6 on page 98 (comparison test). Without looking, see if you can prove (ii) using the contrapositive to (i) for $b_n\ge a_n\ge 0$ (so assuming in addition both are positive, a minor assumption). Try using the monotonicity of the partial sums and part (i). \section{Reading Exercise 2} Look ahead at Definition 17.2. Say $f$ is a continuous function defined on all of $\R$ such that $|f(x)|<|x|$ (so for example $f(x) = x$ of $f(x) = \sqrt{|x|}$. Show that $f$ is continuous at 0 using definition 17.1, then using definition 17.2 (hint: try $\epsilon =\delta$). \section{14.1} \section{14.3} \section{14.6} \section{14.13} \section{15.6} \section{Extra credit: 16.9} \end{document}