{"action":"created","comment":{"url":"https://api.github.com/repos/CVC4/CVC4/pulls/comments/241454118","pull_request_review_id":184716771,"id":241454118,"node_id":"MDI0OlB1bGxSZXF1ZXN0UmV2aWV3Q29tbWVudDI0MTQ1NDExOA==","diff_hunk":"@@ -0,0 +1,101 @@\n+/*********************                                                        */\n+/*! \\file arith_proof_recorder.h\n+ ** \\verbatim\n+ ** Top contributors (to current version):\n+ **   Alex Ozdemir\n+ ** This file is part of the CVC4 project.\n+ ** Copyright (c) 2009-2018 by the authors listed in the file AUTHORS\n+ ** in the top-level source directory) and their institutional affiliations.\n+ ** All rights reserved.  See the file COPYING in the top-level source\n+ ** directory for licensing information.\\endverbatim\n+ **\n+ ** \\brief A class for saving the skeletons of a arithmetic proofs for later.\n+ **\n+ ** In particular, we're interested in proving bottom from a conjunction of\n+ ** theory literals.\n+ **\n+ ** For now, we assume that this can be done using a Farkas combination, and if\n+ ** that doesn't work for some reason, then we give up and \"trust\" the lemma.\n+ ** In the future we'll build support for more sophisticated reasoning.\n+ **\n+ ** Given this scope, our task is to...\n+ **   for each lemma (a set of literals)\n+ **   save the farkas coefficients for those literals\n+ **      which requires we save an ordering of the literals\n+ **      and a parallel ordering of farkas coefficients.\n+ **\n+ ** Farkas proofs have the following cocre structure:\n+ **    For a list of affine bounds: c[i] dot x >= b[i]\n+ **    and a list of non-negative coefficients: f[i],\n+ **    compute\n+ **\n+ **             sum_i{ (c[i] dot x) * f[i] }     and   sum_i{b[i]*f[i]}\n+ **\n+ **    and then verify that the left is actually < the right, a (=><=)","path":"src/proof/arith_proof_recorder.h","position":34,"original_position":34,"commit_id":"296392a010b7f905e88f7855f1b4fd1d8f28167b","original_commit_id":"296392a010b7f905e88f7855f1b4fd1d8f28167b","user":{"login":"yoni206","id":12624708,"node_id":"MDQ6VXNlcjEyNjI0NzA4","avatar_url":"https://avatars2.githubusercontent.com/u/12624708?v=4","gravatar_id":"","url":"https://api.github.com/users/yoni206","html_url":"https://github.com/yoni206","followers_url":"https://api.github.com/users/yoni206/followers","following_url":"https://api.github.com/users/yoni206/following{/other_user}","gists_url":"https://api.github.com/users/yoni206/gists{/gist_id}","starred_url":"https://api.github.com/users/yoni206/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/yoni206/subscriptions","organizations_url":"https://api.github.com/users/yoni206/orgs","repos_url":"https://api.github.com/users/yoni206/repos","events_url":"https://api.github.com/users/yoni206/events{/privacy}","received_events_url":"https://api.github.com/users/yoni206/received_events","type":"User","site_admin":false},"body":"1. Is `x` known at this stage?\r\n2. What is `(=><=)`?\r\n3. Where is this check done in the code?","created_at":"2018-12-13T15:51:49Z","updated_at":"2018-12-13T15:57:54Z","html_url":"https://github.com/CVC4/CVC4/pull/2747#discussion_r241454118","pull_request_url":"https://api.github.com/repos/CVC4/CVC4/pulls/2747","author_association":"CONTRIBUTOR","_links":{"self":{"href":"https://api.github.com/repos/CVC4/CVC4/pulls/comments/241454118"},"html":{"href":"https://github.com/CVC4/CVC4/pull/2747#discussion_r241454118"},"pull_request":{"href":"https://api.github.com/repos/CVC4/CVC4/pulls/2747"}}},"pull_request":{"url":"https://api.github.com/repos/CVC4/CVC4/pulls/2747","id":238208193,"node_id":"MDExOlB1bGxSZXF1ZXN0MjM4MjA4MTkz","html_url":"https://github.com/CVC4/CVC4/pull/2747","diff_url":"https://github.com/CVC4/CVC4/pull/2747.diff","patch_url":"https://github.com/CVC4/CVC4/pull/2747.patch","issue_url":"https://api.github.com/repos/CVC4/CVC4/issues/2747","number":2747,"state":"open","locked":false,"title":" [LRA Proof] Storage for LRA proofs ","user":{"login":"alex-ozdemir","id":5809398,"node_id":"MDQ6VXNlcjU4MDkzOTg=","avatar_url":"https://avatars2.githubusercontent.com/u/5809398?v=4","gravatar_id":"","url":"https://api.github.com/users/alex-ozdemir","html_url":"https://github.com/alex-ozdemir","followers_url":"https://api.github.com/users/alex-ozdemir/followers","following_url":"https://api.github.com/users/alex-ozdemir/following{/other_user}","gists_url":"https://api.github.com/users/alex-ozdemir/gists{/gist_id}","starred_url":"https://api.github.com/users/alex-ozdemir/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/alex-ozdemir/subscriptions","organizations_url":"https://api.github.com/users/alex-ozdemir/orgs","repos_url":"https://api.github.com/users/alex-ozdemir/repos","events_url":"https://api.github.com/users/alex-ozdemir/events{/privacy}","received_events_url":"https://api.github.com/users/alex-ozdemir/received_events","type":"User","site_admin":false},"body":"During LRA solving the `ConstraintDatabase` contains the reasoning\r\nbehind different constraints. Combinations of constraints are\r\nperiodically used to justify lemmas (conflict clauses, propegations, ...\r\n?). `ConstraintDatabase` is SAT context-dependent.\r\n\r\nArithProofRecorder will be used to store concise representations of the\r\nproof for each lemma raised by the (LR)A theory. The (LR)A theory will\r\nwrite to it, and the ArithProof class will read from it to produce LFSC\r\nproofs.\r\n\r\nRight now, it's pretty simplistic -- it allows for only Farkas proofs.\r\n\r\nIn future PRs I'll:\r\n   1. add logic that stores proofs therein\r\n   2. add logic that retrieves and prints proofs\r\n   3. enable LRA proof production, checking, and testing","created_at":"2018-12-12T22:45:26Z","updated_at":"2018-12-13T15:57:54Z","closed_at":null,"merged_at":null,"merge_commit_sha":"91df982cc445fafdeb536452b22ff10ab05f184a","assignee":{"login":"mpreiner","id":4653598,"node_id":"MDQ6VXNlcjQ2NTM1OTg=","avatar_url":"https://avatars0.githubusercontent.com/u/4653598?v=4","gravatar_id":"","url":"https://api.github.com/users/mpreiner","html_url":"https://github.com/mpreiner","followers_url":"https://api.github.com/users/mpreiner/followers","following_url":"https://api.github.com/users/mpreiner/following{/other_user}","gists_url":"https://api.github.com/users/mpreiner/gists{/gist_id}","starred_url":"https://api.github.com/users/mpreiner/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mpreiner/subscriptions","organizations_url":"https://api.github.com/users/mpreiner/orgs","repos_url":"https://api.github.com/users/mpreiner/repos","events_url":"https://api.github.com/users/mpreiner/events{/privacy}","received_events_url":"https://api.github.com/users/mpreiner/received_events","type":"User","site_admin":false},"assignees":[{"login":"mpreiner","id":4653598,"node_id":"MDQ6VXNlcjQ2NTM1OTg=","avatar_url":"https://avatars0.githubusercontent.com/u/4653598?v=4","gravatar_id":"","url":"https://api.github.com/users/mpreiner","html_url":"https://github.com/mpreiner","followers_url":"https://api.github.com/users/mpreiner/followers","following_url":"https://api.github.com/users/mpreiner/following{/other_user}","gists_url":"https://api.github.com/users/mpreiner/gists{/gist_id}","starred_url":"https://api.github.com/users/mpreiner/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mpreiner/subscriptions","organizations_url":"https://api.github.com/users/mpreiner/orgs","repos_url":"https://api.github.com/users/mpreiner/repos","events_url":"https://api.github.com/users/mpreiner/events{/privacy}","received_events_url":"https://api.github.com/users/mpreiner/received_events","type":"User","site_admin":false},{"login":"yoni206","id":12624708,"node_id":"MDQ6VXNlcjEyNjI0NzA4","avatar_url":"https://avatars2.githubusercontent.com/u/12624708?v=4","gravatar_id":"","url":"https://api.github.com/users/yoni206","html_url":"https://github.com/yoni206","followers_url":"https://api.github.com/users/yoni206/followers","following_url":"https://api.github.com/users/yoni206/following{/other_user}","gists_url":"https://api.github.com/users/yoni206/gists{/gist_id}","starred_url":"https://api.github.com/users/yoni206/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/yoni206/subscriptions","organizations_url":"https://api.github.com/users/yoni206/orgs","repos_url":"https://api.github.com/users/yoni206/repos","events_url":"https://api.github.com/users/yoni206/events{/privacy}","received_events_url":"https://api.github.com/users/yoni206/received_events","type":"User","site_admin":false}],"requested_reviewers":[{"login":"mpreiner","id":4653598,"node_id":"MDQ6VXNlcjQ2NTM1OTg=","avatar_url":"https://avatars0.githubusercontent.com/u/4653598?v=4","gravatar_id":"","url":"https://api.github.com/users/mpreiner","html_url":"https://github.com/mpreiner","followers_url":"https://api.github.com/users/mpreiner/followers","following_url":"https://api.github.com/users/mpreiner/following{/other_user}","gists_url":"https://api.github.com/users/mpreiner/gists{/gist_id}","starred_url":"https://api.github.com/users/mpreiner/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mpreiner/subscriptions","organizations_url":"https://api.github.com/users/mpreiner/orgs","repos_url":"https://api.github.com/users/mpreiner/repos","events_url":"https://api.github.com/users/mpreiner/events{/privacy}","received_events_url":"https://api.github.com/users/mpreiner/received_events","type":"User","site_admin":false}],"requested_teams":[],"labels":[{"id":717338434,"node_id":"MDU6TGFiZWw3MTczMzg0MzQ=","url":"https://api.github.com/repos/CVC4/CVC4/labels/moderate","name":"moderate","color":"88ccf5","default":false},{"id":671891100,"node_id":"MDU6TGFiZWw2NzE4OTExMDA=","url":"https://api.github.com/repos/CVC4/CVC4/labels/normal","name":"normal","color":"ededed","default":false}],"milestone":null,"commits_url":"https://api.github.com/repos/CVC4/CVC4/pulls/2747/commits","review_comments_url":"https://api.github.com/repos/CVC4/CVC4/pulls/2747/comments","review_comment_url":"https://api.github.com/repos/CVC4/CVC4/pulls/comments{/number}","comments_url":"https://api.github.com/repos/CVC4/CVC4/issues/2747/comments","statuses_url":"https://api.github.com/repos/CVC4/CVC4/statuses/296392a010b7f905e88f7855f1b4fd1d8f28167b","head":{"label":"alex-ozdemir:arith-pf-infra","ref":"arith-pf-infra","sha":"296392a010b7f905e88f7855f1b4fd1d8f28167b","user":{"login":"alex-ozdemir","id":5809398,"node_id":"MDQ6VXNlcjU4MDkzOTg=","avatar_url":"https://avatars2.githubusercontent.com/u/5809398?v=4","gravatar_id":"","url":"https://api.github.com/users/alex-ozdemir","html_url":"https:/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