{"action":"opened","number":22,"pull_request":{"url":"https://api.github.com/repos/metamath/set.mm/pulls/22","id":51742330,"html_url":"https://github.com/metamath/set.mm/pull/22","diff_url":"https://github.com/metamath/set.mm/pull/22.diff","patch_url":"https://github.com/metamath/set.mm/pull/22.patch","issue_url":"https://api.github.com/repos/metamath/set.mm/issues/22","number":22,"state":"open","locked":false,"title":"Exponential growth and decay model, and more function operations.","user":{"login":"steverod","id":14365461,"avatar_url":"https://avatars.githubusercontent.com/u/14365461?v=3","gravatar_id":"","url":"https://api.github.com/users/steverod","html_url":"https://github.com/steverod","followers_url":"https://api.github.com/users/steverod/followers","following_url":"https://api.github.com/users/steverod/following{/other_user}","gists_url":"https://api.github.com/users/steverod/gists{/gist_id}","starred_url":"https://api.github.com/users/steverod/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/steverod/subscriptions","organizations_url":"https://api.github.com/users/steverod/orgs","repos_url":"https://api.github.com/users/steverod/repos","events_url":"https://api.github.com/users/steverod/events{/privacy}","received_events_url":"https://api.github.com/users/steverod/received_events","type":"User","site_admin":false},"body":"At long last, the theorems discussed at <https://groups.google.com/forum/#!topic/metamath/CKF4bpLaH0I>, and a few function operations.\r\n\r\nAlso ` ssrecnpr ` and (as discussed at <https://groups.google.com/forum/#!topic/metamath/cjxfDdy4yyc>) ` ssdifeq0 `, but since they nor the ` ofmul0or ` theorem I had in mind were not needed for ` expgrowth ` after all (and I'm not sure ` ofmul0or ` as I had thought of it was even *provable*)  I probably won't work with those two further.\r\n\r\nThe reference [Strang] in expgrowth is:\r\n\r\n* Strang, Gilbert, Calculus, 1st ed., Wellesley-Cambridge Press (1991) [QA???]; ISBN 978-09802327-45, available at http://ocw.mit.edu/resources/res-18-001-calculus-online-textbook-spring-2005/.\r\n\r\nThe (in my opinion, fittingly) long description of expgrowth uses the ` y' ` symbol from Jonathan Ben-Naim's mathbox; seemed to make sense there.  If there are better sources etc., I certainly don't mind changes to that wall of 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