How to derive the formal dual of the covariant exterior derivative?











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I am reading Jost's Riemannian Geometry and Geometric Analysis. I have a few questions when deriving the formal dual of the covariant exterior derivative, arising from the following pictures from the book.



First of all, what is the definition of the innner product $(cdot,cdot)$ in the space $Omega^p(text{Ad} E)$? Then how to derive the formal dual $D^*$ in $(4.2.6)$? And finally, what is the meaning of the last sentence: $A$ operates on the form part by contraction and not by multiplication with $dx^i$"?



I am totally confused here... Any hints or comments will be appreciated! TIA...






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    up vote
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    down vote

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    I am reading Jost's Riemannian Geometry and Geometric Analysis. I have a few questions when deriving the formal dual of the covariant exterior derivative, arising from the following pictures from the book.



    First of all, what is the definition of the innner product $(cdot,cdot)$ in the space $Omega^p(text{Ad} E)$? Then how to derive the formal dual $D^*$ in $(4.2.6)$? And finally, what is the meaning of the last sentence: $A$ operates on the form part by contraction and not by multiplication with $dx^i$"?



    I am totally confused here... Any hints or comments will be appreciated! TIA...






    enter image description hereenter image description here











    share|cite|improve this question


























      up vote
      1
      down vote

      favorite









      up vote
      1
      down vote

      favorite











      I am reading Jost's Riemannian Geometry and Geometric Analysis. I have a few questions when deriving the formal dual of the covariant exterior derivative, arising from the following pictures from the book.



      First of all, what is the definition of the innner product $(cdot,cdot)$ in the space $Omega^p(text{Ad} E)$? Then how to derive the formal dual $D^*$ in $(4.2.6)$? And finally, what is the meaning of the last sentence: $A$ operates on the form part by contraction and not by multiplication with $dx^i$"?



      I am totally confused here... Any hints or comments will be appreciated! TIA...






      enter image description hereenter image description here











      share|cite|improve this question















      I am reading Jost's Riemannian Geometry and Geometric Analysis. I have a few questions when deriving the formal dual of the covariant exterior derivative, arising from the following pictures from the book.



      First of all, what is the definition of the innner product $(cdot,cdot)$ in the space $Omega^p(text{Ad} E)$? Then how to derive the formal dual $D^*$ in $(4.2.6)$? And finally, what is the meaning of the last sentence: $A$ operates on the form part by contraction and not by multiplication with $dx^i$"?



      I am totally confused here... Any hints or comments will be appreciated! TIA...






      enter image description hereenter image description here








      geometry differential-geometry riemannian-geometry






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      edited Nov 18 at 4:25

























      asked Nov 18 at 4:13









      Q. Huang

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