{"action":"closed","issue":{"url":"https://api.github.com/repos/sympy/sympy/issues/12257","repository_url":"https://api.github.com/repos/sympy/sympy","labels_url":"https://api.github.com/repos/sympy/sympy/issues/12257/labels{/name}","comments_url":"https://api.github.com/repos/sympy/sympy/issues/12257/comments","events_url":"https://api.github.com/repos/sympy/sympy/issues/12257/events","html_url":"https://github.com/sympy/sympy/issues/12257","id":212118109,"number":12257,"title":"Simplifications in Dirac Delta function","user":{"login":"mohit3011","id":19210197,"avatar_url":"https://avatars3.githubusercontent.com/u/19210197?v=3","gravatar_id":"","url":"https://api.github.com/users/mohit3011","html_url":"https://github.com/mohit3011","followers_url":"https://api.github.com/users/mohit3011/followers","following_url":"https://api.github.com/users/mohit3011/following{/other_user}","gists_url":"https://api.github.com/users/mohit3011/gists{/gist_id}","starred_url":"https://api.github.com/users/mohit3011/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mohit3011/subscriptions","organizations_url":"https://api.github.com/users/mohit3011/orgs","repos_url":"https://api.github.com/users/mohit3011/repos","events_url":"https://api.github.com/users/mohit3011/events{/privacy}","received_events_url":"https://api.github.com/users/mohit3011/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":9,"created_at":"2017-03-06T13:12:01Z","updated_at":"2017-03-28T16:38:33Z","closed_at":"2017-03-28T16:38:33Z","body":"It seems that the Dirac Delta function might be more useful if certain simplifications can be done.\r\nFor Example:\r\n\r\n- For using the symmetry property of the dirac delta function i.e DiracDelta(x)==DiracDelta(-x) . The existing provision for this is `DiracDelta(-x).expand(diracdelta=True, wrt=x)` . As of now we have this\r\n```\r\n>>> DiracDelta(-x)\r\nDiracDelta(-x)\r\n\r\n```\r\nWhat I hope after this issue would be \r\n```\r\n>>> DiracDelta(-x)\r\nDiracDelta(x)\r\n\r\n```\r\n- Also we can include the property like DiracDelta(m*x) = DiracDelta(x)/m , where m is an integer . This feature is also presently implemented like `DiracDelta(2*x).expand(diracdelta=True, wrt=x)`\r\n\r\nWe can have the existing way when more than one variables are involved . For constants, we can include it in basic cases.\r\n\r\nI have read the code regarding this and it would be really nice , if someone could guide me in this. "}}
{"actor":{"display_login":"mohit3011"}}