Asinthepreviouseditions,myguidingphilosophyinwritingthisbookhasthreeelements.Thefirstelementismybeliefthatinthelongrunstudentsarebestservedbylearningbasicconceptsinageneralsetting.Second,Ibelievethatstudentsneedtobemotivatedbyseeinghowtheprinciplesapplytospecificandinterestingproblemsintheirownfields.Thethirdelementofmyphilosoph