feat: Defining Greedoid #10186
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feat: Defining Greedoid #10186
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…oid-for-contrib Further work on greedoid-for-contrib will be done on its own branch.
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The
workingold branch for this project is greedoid-defs. This branch does not contain all features of theworkingold branch, and is for real contribution to Mathlib.The current branch have three files
Accessible.lean,Exchange.leanandBasic.lean.Before greedoid is properly defined, it defines two concepts on set systems, namely
ExchangePropertyinExchange.leanandAccessiblePropertyandAccessibleinAccessible.lean.Greedoidis a structure of set systems containing empty set, which satisfies anExchangeProperty, and is defined inBasic.lean.Basic.lean(will be added later), changed pull request title.Basic.lean, but removed theorems related toexchangePropertyandaccessibleProperty. Removed theorems are likely to be added in the next commit.GreedoidusesFinset α → Propas a feasible set.ground_setis present as there are some appearance of minors in the literature.