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...Chapterlinearsystems exercises for section since a paul s making proat x has beneacial effect on proats in the future because ax term makes positive contribution to dx dt however b bob aproat y hinders ability make by contributes negatively roughlyspeaking business is good if his store proatable and not fact sproats will increase whenever more than even though dy this choice of parameters interpretation equation exactly opposite from point view d are hurt he but helped cx once again moreproatable finally note that both change identical amounts always equal some sense proatability twice impact as does example at least one half c consequently affected either hence constant model andb we have then those no standard exponential growth andd stores negative beneat moreover or other words same situation contribute notethatthismodelissymmetricinthesensethatbothpaulandbobperceiveeachothersproats way symmetry comes p q r properties linear systems linearity principle t deta ad bc thus nonzero equ...