{"action":"created","issue":{"url":"https://api.github.com/repos/Macaulay2/M2/issues/756","repository_url":"https://api.github.com/repos/Macaulay2/M2","labels_url":"https://api.github.com/repos/Macaulay2/M2/issues/756/labels{/name}","comments_url":"https://api.github.com/repos/Macaulay2/M2/issues/756/comments","events_url":"https://api.github.com/repos/Macaulay2/M2/issues/756/events","html_url":"https://github.com/Macaulay2/M2/issues/756","id":304119815,"number":756,"title":"Prune in skew-commutative rings","user":{"login":"pzinn","id":4632711,"avatar_url":"https://avatars1.githubusercontent.com/u/4632711?v=4","gravatar_id":"","url":"https://api.github.com/users/pzinn","html_url":"https://github.com/pzinn","followers_url":"https://api.github.com/users/pzinn/followers","following_url":"https://api.github.com/users/pzinn/following{/other_user}","gists_url":"https://api.github.com/users/pzinn/gists{/gist_id}","starred_url":"https://api.github.com/users/pzinn/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/pzinn/subscriptions","organizations_url":"https://api.github.com/users/pzinn/orgs","repos_url":"https://api.github.com/users/pzinn/repos","events_url":"https://api.github.com/users/pzinn/events{/privacy}","received_events_url":"https://api.github.com/users/pzinn/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":{"url":"https://api.github.com/repos/Macaulay2/M2/milestones/7","html_url":"https://github.com/Macaulay2/M2/milestone/7","labels_url":"https://api.github.com/repos/Macaulay2/M2/milestones/7/labels","id":3127012,"number":7,"title":"version 1.12","description":"","creator":{"login":"DanGrayson","id":700228,"avatar_url":"https://avatars1.githubusercontent.com/u/700228?v=4","gravatar_id":"","url":"https://api.github.com/users/DanGrayson","html_url":"https://github.com/DanGrayson","followers_url":"https://api.github.com/users/DanGrayson/followers","following_url":"https://api.github.com/users/DanGrayson/following{/other_user}","gists_url":"https://api.github.com/users/DanGrayson/gists{/gist_id}","starred_url":"https://api.github.com/users/DanGrayson/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/DanGrayson/subscriptions","organizations_url":"https://api.github.com/users/DanGrayson/orgs","repos_url":"https://api.github.com/users/DanGrayson/repos","events_url":"https://api.github.com/users/DanGrayson/events{/privacy}","received_events_url":"https://api.github.com/users/DanGrayson/received_events","type":"User","site_admin":false},"open_issues":106,"closed_issues":2,"state":"open","created_at":"2018-02-19T14:03:18Z","updated_at":"2018-03-11T12:11:00Z","due_on":"2018-09-01T07:00:00Z","closed_at":null},"comments":7,"created_at":"2018-03-11T00:56:44Z","updated_at":"2018-03-11T12:40:02Z","closed_at":null,"author_association":"CONTRIBUTOR","body":"consider the following:\r\n```\r\ni1 : R=QQ[a_0..a_4,SkewCommutative=>toList(0..4)]\r\n\r\no1 = R\r\n\r\no1 : PolynomialRing\r\n\r\ni2 : I=ideal (a_0,a_2,a_1*a_3)\r\n\r\no2 = ideal (a , a , a a )\r\n             0   2   1 3\r\n\r\no2 : Ideal of R\r\n\r\ni3 : prune I\r\n\r\no3 = ideal 0\r\n\r\no3 : Ideal of QQ[a , a , a ]\r\n                  1   3   4\r\n```\r\nThat seems wrong to me. Either this needs to be fixed, or if `Prune` can't handle `SkewCommutative` rings, then it should probably give an error message.\r\n"},"comment":{"url":"https://api.github.com/repos/Macaulay2/M2/issues/comments/372112410","html_url":"https://github.com/Macaulay2/M2/issues/756#issuecomment-372112410","issue_url":"https://api.github.com/repos/Macaulay2/M2/issues/756","id":372112410,"user":{"login":"DanGrayson","id":700228,"avatar_url":"https://avatars1.githubusercontent.com/u/700228?v=4","gravatar_id":"","url":"https://api.github.com/users/DanGrayson","html_url":"https://github.com/DanGrayson","followers_url":"https://api.github.com/users/DanGrayson/followers","following_url":"https://api.github.com/users/DanGrayson/following{/other_user}","gists_url":"https://api.github.com/users/DanGrayson/gists{/gist_id}","starred_url":"https://api.github.com/users/DanGrayson/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/DanGrayson/subscriptions","organizations_url":"https://api.github.com/users/DanGrayson/orgs","repos_url":"https://api.github.com/users/DanGrayson/repos","events_url":"https://api.github.com/users/DanGrayson/events{/privacy}","received_events_url":"https://api.github.com/users/DanGrayson/received_events","type":"User","site_admin":false},"created_at":"2018-03-11T12:40:02Z","updated_at":"2018-03-11T12:40:02Z","author_association":"OWNER","body":"Hmm?  It looks like it computes the gb anyway:\r\n```\r\n        * Consequences:\r\n            * minimalPresentation stores the isomorphism  from S/I to Q/J as\r\n              I.cache.minimalPresentationMap , where I is the input ideal and the inverse of\r\n              this map as I.cache.minimalPresentationMapInv\r\n```"}}
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