Projection formula for proper maps of manifolds











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Let $X,Y$ be (not necessarily compact) orientable manifolds without boundaries of dimension $m$ and $n$. Let $f : X rightarrow Y$ be a proper map. Assume that all the cohomologies have coefficients in $mathbb{Q}$. We could define the following pullback maps



$$f^* : H^*(Y) rightarrow H^*(X), f^*_c : H^*_c(Y) rightarrow H^*_c(X)$$



We also have the following maps defined by their poincare duals



$$ f_{!,c} : H^*_c(X) rightarrow H^{*+(n-m)}_c(Y), f_! : H^*(X) rightarrow H^{*+(n-m)}(Y) $$



I am interested in knowing the projection formulas that are available in this setup. A little bit of googling up gives the following link



https://mathoverflow.net/questions/67228/where-do-all-these-projection-formulas-come-from



and



https://mathoverflow.net/questions/18799/ubiquity-of-the-push-pull-formula



which seems useful but they are not the kind of equality I am interested in. I am wondering if the following is true for $alpha in H^*_c(Y), beta in H^*(X)$.



$$f_!(f^*_c(alpha) cup beta) = alpha cup f_!(beta)$$



Q1. Are there other kinds of projection formulas available?



Q2. Which of them are poincare dual or related to the others?



It would be extremely helpful if the answers contain references if not the proofs themselves. I am not sure if the notations I have used are the correct ones. Please feel free to edit accordingly.



Thanks!










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    Let $X,Y$ be (not necessarily compact) orientable manifolds without boundaries of dimension $m$ and $n$. Let $f : X rightarrow Y$ be a proper map. Assume that all the cohomologies have coefficients in $mathbb{Q}$. We could define the following pullback maps



    $$f^* : H^*(Y) rightarrow H^*(X), f^*_c : H^*_c(Y) rightarrow H^*_c(X)$$



    We also have the following maps defined by their poincare duals



    $$ f_{!,c} : H^*_c(X) rightarrow H^{*+(n-m)}_c(Y), f_! : H^*(X) rightarrow H^{*+(n-m)}(Y) $$



    I am interested in knowing the projection formulas that are available in this setup. A little bit of googling up gives the following link



    https://mathoverflow.net/questions/67228/where-do-all-these-projection-formulas-come-from



    and



    https://mathoverflow.net/questions/18799/ubiquity-of-the-push-pull-formula



    which seems useful but they are not the kind of equality I am interested in. I am wondering if the following is true for $alpha in H^*_c(Y), beta in H^*(X)$.



    $$f_!(f^*_c(alpha) cup beta) = alpha cup f_!(beta)$$



    Q1. Are there other kinds of projection formulas available?



    Q2. Which of them are poincare dual or related to the others?



    It would be extremely helpful if the answers contain references if not the proofs themselves. I am not sure if the notations I have used are the correct ones. Please feel free to edit accordingly.



    Thanks!










    share|cite|improve this question


























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      Let $X,Y$ be (not necessarily compact) orientable manifolds without boundaries of dimension $m$ and $n$. Let $f : X rightarrow Y$ be a proper map. Assume that all the cohomologies have coefficients in $mathbb{Q}$. We could define the following pullback maps



      $$f^* : H^*(Y) rightarrow H^*(X), f^*_c : H^*_c(Y) rightarrow H^*_c(X)$$



      We also have the following maps defined by their poincare duals



      $$ f_{!,c} : H^*_c(X) rightarrow H^{*+(n-m)}_c(Y), f_! : H^*(X) rightarrow H^{*+(n-m)}(Y) $$



      I am interested in knowing the projection formulas that are available in this setup. A little bit of googling up gives the following link



      https://mathoverflow.net/questions/67228/where-do-all-these-projection-formulas-come-from



      and



      https://mathoverflow.net/questions/18799/ubiquity-of-the-push-pull-formula



      which seems useful but they are not the kind of equality I am interested in. I am wondering if the following is true for $alpha in H^*_c(Y), beta in H^*(X)$.



      $$f_!(f^*_c(alpha) cup beta) = alpha cup f_!(beta)$$



      Q1. Are there other kinds of projection formulas available?



      Q2. Which of them are poincare dual or related to the others?



      It would be extremely helpful if the answers contain references if not the proofs themselves. I am not sure if the notations I have used are the correct ones. Please feel free to edit accordingly.



      Thanks!










      share|cite|improve this question















      Let $X,Y$ be (not necessarily compact) orientable manifolds without boundaries of dimension $m$ and $n$. Let $f : X rightarrow Y$ be a proper map. Assume that all the cohomologies have coefficients in $mathbb{Q}$. We could define the following pullback maps



      $$f^* : H^*(Y) rightarrow H^*(X), f^*_c : H^*_c(Y) rightarrow H^*_c(X)$$



      We also have the following maps defined by their poincare duals



      $$ f_{!,c} : H^*_c(X) rightarrow H^{*+(n-m)}_c(Y), f_! : H^*(X) rightarrow H^{*+(n-m)}(Y) $$



      I am interested in knowing the projection formulas that are available in this setup. A little bit of googling up gives the following link



      https://mathoverflow.net/questions/67228/where-do-all-these-projection-formulas-come-from



      and



      https://mathoverflow.net/questions/18799/ubiquity-of-the-push-pull-formula



      which seems useful but they are not the kind of equality I am interested in. I am wondering if the following is true for $alpha in H^*_c(Y), beta in H^*(X)$.



      $$f_!(f^*_c(alpha) cup beta) = alpha cup f_!(beta)$$



      Q1. Are there other kinds of projection formulas available?



      Q2. Which of them are poincare dual or related to the others?



      It would be extremely helpful if the answers contain references if not the proofs themselves. I am not sure if the notations I have used are the correct ones. Please feel free to edit accordingly.



      Thanks!







      general-topology algebraic-topology duality-theorems poincare-duality






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      edited 2 days ago

























      asked Nov 12 at 17:30









      random123

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