Integral of Legendre polynomials and Associated Legendre polynomials












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I am trying to find the solution to the following integrals. I am quite sure these are well known, but somehow i did not find them already solved online:



1) $int_0^pi P_l(cos{theta}) P_{l'}^{pm 1} (cos{theta}) , dtheta$



2) $int_0^pi P_l(cos{theta}) frac{d}{dtheta} left[P_{l'}^{pm 1} (cos{theta}) right] sin{theta} , dtheta$



and



3) $int_0^pi P_l(cos{theta}) frac{d}{dtheta} left[P_{l'} (cos{theta}) right] sin{theta} , dtheta$



Where $P_l (cos{theta})$ is the Legendre polynomial of degree $l$, $P_{l'}^{pm 1} (cos{theta})$ is the associate Legendre polynomial of degree $l'$ and order $pm 1$. I am only interested to the case of $l$ and $l'$ integers and $l ge 0$ and $l^{'} ge 0$.










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    $begingroup$


    I am trying to find the solution to the following integrals. I am quite sure these are well known, but somehow i did not find them already solved online:



    1) $int_0^pi P_l(cos{theta}) P_{l'}^{pm 1} (cos{theta}) , dtheta$



    2) $int_0^pi P_l(cos{theta}) frac{d}{dtheta} left[P_{l'}^{pm 1} (cos{theta}) right] sin{theta} , dtheta$



    and



    3) $int_0^pi P_l(cos{theta}) frac{d}{dtheta} left[P_{l'} (cos{theta}) right] sin{theta} , dtheta$



    Where $P_l (cos{theta})$ is the Legendre polynomial of degree $l$, $P_{l'}^{pm 1} (cos{theta})$ is the associate Legendre polynomial of degree $l'$ and order $pm 1$. I am only interested to the case of $l$ and $l'$ integers and $l ge 0$ and $l^{'} ge 0$.










    share|cite|improve this question









    $endgroup$















      0












      0








      0





      $begingroup$


      I am trying to find the solution to the following integrals. I am quite sure these are well known, but somehow i did not find them already solved online:



      1) $int_0^pi P_l(cos{theta}) P_{l'}^{pm 1} (cos{theta}) , dtheta$



      2) $int_0^pi P_l(cos{theta}) frac{d}{dtheta} left[P_{l'}^{pm 1} (cos{theta}) right] sin{theta} , dtheta$



      and



      3) $int_0^pi P_l(cos{theta}) frac{d}{dtheta} left[P_{l'} (cos{theta}) right] sin{theta} , dtheta$



      Where $P_l (cos{theta})$ is the Legendre polynomial of degree $l$, $P_{l'}^{pm 1} (cos{theta})$ is the associate Legendre polynomial of degree $l'$ and order $pm 1$. I am only interested to the case of $l$ and $l'$ integers and $l ge 0$ and $l^{'} ge 0$.










      share|cite|improve this question









      $endgroup$




      I am trying to find the solution to the following integrals. I am quite sure these are well known, but somehow i did not find them already solved online:



      1) $int_0^pi P_l(cos{theta}) P_{l'}^{pm 1} (cos{theta}) , dtheta$



      2) $int_0^pi P_l(cos{theta}) frac{d}{dtheta} left[P_{l'}^{pm 1} (cos{theta}) right] sin{theta} , dtheta$



      and



      3) $int_0^pi P_l(cos{theta}) frac{d}{dtheta} left[P_{l'} (cos{theta}) right] sin{theta} , dtheta$



      Where $P_l (cos{theta})$ is the Legendre polynomial of degree $l$, $P_{l'}^{pm 1} (cos{theta})$ is the associate Legendre polynomial of degree $l'$ and order $pm 1$. I am only interested to the case of $l$ and $l'$ integers and $l ge 0$ and $l^{'} ge 0$.







      integration definite-integrals legendre-polynomials






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      asked Jan 8 at 18:11









      SSC NapoliSSC Napoli

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