{"action":"created","issue":{"url":"https://api.github.com/repos/sympy/sympy/issues/9819","repository_url":"https://api.github.com/repos/sympy/sympy","labels_url":"https://api.github.com/repos/sympy/sympy/issues/9819/labels{/name}","comments_url":"https://api.github.com/repos/sympy/sympy/issues/9819/comments","events_url":"https://api.github.com/repos/sympy/sympy/issues/9819/events","html_url":"https://github.com/sympy/sympy/issues/9819","id":100639689,"number":9819,"title":"ODE solver cannot solve Bessel equation","user":{"login":"ens2013","id":3247670,"avatar_url":"https://avatars.githubusercontent.com/u/3247670?v=3","gravatar_id":"","url":"https://api.github.com/users/ens2013","html_url":"https://github.com/ens2013","followers_url":"https://api.github.com/users/ens2013/followers","following_url":"https://api.github.com/users/ens2013/following{/other_user}","gists_url":"https://api.github.com/users/ens2013/gists{/gist_id}","starred_url":"https://api.github.com/users/ens2013/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ens2013/subscriptions","organizations_url":"https://api.github.com/users/ens2013/orgs","repos_url":"https://api.github.com/users/ens2013/repos","events_url":"https://api.github.com/users/ens2013/events{/privacy}","received_events_url":"https://api.github.com/users/ens2013/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/sympy/sympy/labels/solvers.dsolve","name":"solvers.dsolve","color":"0000FF"}],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":4,"created_at":"2015-08-12T21:29:50Z","updated_at":"2016-03-15T05:45:33Z","closed_at":null,"body":"I tried to solve the Bessel equation with Sympy (version 0.7.6), but got a weird result (the Bessel function is expected):\r\n````\r\n>>> x = symbols('x')\r\n>>> f = Function('f')\r\n>>> eq=Derivative(f(x),x,2)*x*x+x*Derivative(f(x),x,1)+(x*x)*f(x)\r\n>>> dsolve(eq)\r\nf(x) == C1*(x**4/64 - x**2/4 + 1) + O(x**6)\r\n````"},"comment":{"url":"https://api.github.com/repos/sympy/sympy/issues/comments/196675387","html_url":"https://github.com/sympy/sympy/issues/9819#issuecomment-196675387","issue_url":"https://api.github.com/repos/sympy/sympy/issues/9819","id":196675387,"user":{"login":"nagarakshay","id":17586347,"avatar_url":"https://avatars.githubusercontent.com/u/17586347?v=3","gravatar_id":"","url":"https://api.github.com/users/nagarakshay","html_url":"https://github.com/nagarakshay","followers_url":"https://api.github.com/users/nagarakshay/followers","following_url":"https://api.github.com/users/nagarakshay/following{/other_user}","gists_url":"https://api.github.com/users/nagarakshay/gists{/gist_id}","starred_url":"https://api.github.com/users/nagarakshay/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/nagarakshay/subscriptions","organizations_url":"https://api.github.com/users/nagarakshay/orgs","repos_url":"https://api.github.com/users/nagarakshay/repos","events_url":"https://api.github.com/users/nagarakshay/events{/privacy}","received_events_url":"https://api.github.com/users/nagarakshay/received_events","type":"User","site_admin":false},"created_at":"2016-03-15T05:45:33Z","updated_at":"2016-03-15T05:45:33Z","body":"@zanzibar7 Thank you. I will surely have a look. I will incorporate them in my PR.\r\n"}}