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fix bug in bound simplification in Gomory for mixed integer linear cuts, enable fixed variable redution after bugfix, add notes that rewriting bounds does not work

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2023-11-10 16:38:55 +01:00
parent aa9c7912dc
commit 3de5af3cb0
5 changed files with 121 additions and 261 deletions
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6
src/math/lp/int_solver.h
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@ -68,7 +68,7 @@ class int_solver {
hnf_cutter m_hnf_cutter;
unsigned m_hnf_cut_period;
unsigned_vector m_cut_vars; // variables that should not be selected for cuts
vector<equality> m_equalities;
public:
int_solver(lar_solver& lp);
@ -111,8 +111,8 @@ private:
bool has_upper(unsigned j) const;
unsigned row_of_basic_column(unsigned j) const;
bool cut_indices_are_columns() const;
lia_move local_gomory(unsigned num_cuts);
lia_move local_cut(unsigned num_cuts, std::function<lia_move(void)>& cut_fn);
public:
std::ostream& display_column(std::ostream & out, unsigned j) const;
u_dependency* column_upper_bound_constraint(unsigned j) const;