{"action":"created","issue":{"url":"https://api.github.com/repos/sympy/sympy/issues/11462","repository_url":"https://api.github.com/repos/sympy/sympy","labels_url":"https://api.github.com/repos/sympy/sympy/issues/11462/labels{/name}","comments_url":"https://api.github.com/repos/sympy/sympy/issues/11462/comments","events_url":"https://api.github.com/repos/sympy/sympy/issues/11462/events","html_url":"https://github.com/sympy/sympy/pull/11462","id":168811252,"number":11462,"title":"Check Meijer G-function parameters","user":{"login":"jksuom","id":6929119,"avatar_url":"https://avatars.githubusercontent.com/u/6929119?v=3","gravatar_id":"","url":"https://api.github.com/users/jksuom","html_url":"https://github.com/jksuom","followers_url":"https://api.github.com/users/jksuom/followers","following_url":"https://api.github.com/users/jksuom/following{/other_user}","gists_url":"https://api.github.com/users/jksuom/gists{/gist_id}","starred_url":"https://api.github.com/users/jksuom/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jksuom/subscriptions","organizations_url":"https://api.github.com/users/jksuom/orgs","repos_url":"https://api.github.com/users/jksuom/repos","events_url":"https://api.github.com/users/jksuom/events{/privacy}","received_events_url":"https://api.github.com/users/jksuom/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":2,"created_at":"2016-08-02T06:45:19Z","updated_at":"2016-08-04T04:45:38Z","closed_at":null,"pull_request":{"url":"https://api.github.com/repos/sympy/sympy/pulls/11462","html_url":"https://github.com/sympy/sympy/pull/11462","diff_url":"https://github.com/sympy/sympy/pull/11462.diff","patch_url":"https://github.com/sympy/sympy/pull/11462.patch"},"body":"A Meijer G-function with indices m, n, p, q is defined only if no parameter a1, ..., an differs from a parameter b1, ..., bm by a positive integer. This PR checks the parameters.\r\nCurrently some integrations, e.g. the one in #8733, return meaningless expressions."},"comment":{"url":"https://api.github.com/repos/sympy/sympy/issues/comments/237451452","html_url":"https://github.com/sympy/sympy/pull/11462#issuecomment-237451452","issue_url":"https://api.github.com/repos/sympy/sympy/issues/11462","id":237451452,"user":{"login":"jksuom","id":6929119,"avatar_url":"https://avatars.githubusercontent.com/u/6929119?v=3","gravatar_id":"","url":"https://api.github.com/users/jksuom","html_url":"https://github.com/jksuom","followers_url":"https://api.github.com/users/jksuom/followers","following_url":"https://api.github.com/users/jksuom/following{/other_user}","gists_url":"https://api.github.com/users/jksuom/gists{/gist_id}","starred_url":"https://api.github.com/users/jksuom/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jksuom/subscriptions","organizations_url":"https://api.github.com/users/jksuom/orgs","repos_url":"https://api.github.com/users/jksuom/repos","events_url":"https://api.github.com/users/jksuom/events{/privacy}","received_events_url":"https://api.github.com/users/jksuom/received_events","type":"User","site_admin":false},"created_at":"2016-08-04T04:45:38Z","updated_at":"2016-08-04T04:45:38Z","body":"The decision can be made only after the parameter values have been determined by [substitutions](https://github.com/sympy/sympy/blob/master/sympy/integrals/meijerint.py#L1464). This seemed a natural location, analogous to [this](https://github.com/sympy/sympy/blob/master/sympy/integrals/meijerint.py#L1468).\r\n\r\n(Conditions like this could be added as hints to the tables, separately on each line with substitutable parameters, but I would prefer to have them checked in one place since they apply to *all* G-functions.)  "}}
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