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\usepackage{amssymb}  \begin{document}  \section{Chapter 1 solution} \\  2) Negation:  a) Steve has less than 100 GB free disk space on his laptop.  b) Zach did not blocks e-mails and texts from Jennifer.  c) 7.11.13\ne999  4) a) converse:"I will ski tomorrow only if it snows today"\\  Contrapositive:"If i don't ski tomorrow, then it will not have snowed today."\\  b) Converse:"I come to class only if there going to be a quiz"\\