68 theorysupplementsectionm m proofofthedivergencetheoremandstokes theorem in this section we give proofs of the divergence theorem and stokes theorem using the denitions in cartesian coordinates proof of the divergence theorem let ...
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...Theorysupplementsectionm m proofofthedivergencetheoremandstokes theorem in this section we give proofs of the divergence and stokes using denitions cartesian coordinates proof let f be a smooth vector eld dened on solid region v with boundary surface oriented outward wish to show that z af da divf dv for use same approach as used green s rst prove rectangular regions then change variables formula it regionsparameterizedbyrectangularregions andnallypastesuchregionstogethertoformgeneral solids sides parallel axes consider x b c y d e see figure start by computing ux through two faces perpendicular axis both dydz bythefundamentaltheoremofcalculus dx so dxdydz byasimilar argument can adding these get is back u w right left t bottom stu space corresponding xyz curved parameterized nowsupposewehaveasmoothchangeofcoordinates suppose one interior its jacobian determinant positive must first express integral over notation r i j k theface face dtdu fact order make point choose negative sign prob...