Lifting Gomory cuts with bounded variables

نویسندگان

  • Gérard Cornuéjols
  • Tamás Kis
  • Marco Molinaro
چکیده

Recently, Balas and Qualizza introduced a new cut for mixed 0,1 programs, called lopsided cut. Here we present a family of cuts that comprises the Gomory mixed integer cut at one extreme and the lopsided cut at the other. We show that every inequality in this family is extreme for the appropriate infinite relaxation. We also show that these inequalities are split cuts. Finally we provide computational results.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

On the Rank of Mixed 0,1 Polyhedra G erard Cornu ejols

For a polytope in the [0; 1] cube, Eisenbrand and Schulz showed recently that the maximum Chv atal rank is bounded above by O(n2logn) and bounded below by (1 + )n for some > 0. Chv atal cuts are equivalent to Gomory fractional cuts, which are themselves dominated by Gomory mixed integer cuts. What do these upper and lower bounds become when the rank is de ned relative to Gomory mixed integer cu...

متن کامل

On the Rank of Mixed 0, 1 Polyhedra

For a polytope in the [0; 1] cube, Eisenbrand and Schulz showed recently that the maximum Chv atal rank is bounded above by O(n2logn) and bounded below by (1 + )n for some > 0. Chv atal cuts are equivalent to Gomory fractional cuts, which are themselves dominated by Gomory mixed integer cuts. What do these upper and lower bounds become when the rank is de ned relative to Gomory mixed integer cu...

متن کامل

Foundation-penalty cuts for mixed-integer programs

We propose a new class of Foundation-Penalty (FP) cuts for GUB-constrained (and ordinary) mixed-integer programs, which are easy to generate by exploiting standard penalty calculations that are routinely employed in branch-and-bound contexts. The FP cuts are derived with reference to a selected integer variable or GUB set, and a foundation function that is typically a reduced cost function corr...

متن کامل

Gomory cuts revisited

In this paper, we investigate the use of Gomory's mixed integer cuts within a branch-and-cut framework. It has been argued in the literature that \a marriage of classical cutting planes and tree search is out of the question as far as the solution of large-scale combinatorial optimization problems is concerned" 16] because the cuts generated at one node of the search tree need not be valid at o...

متن کامل

Computing with Multi-Row Intersection Cuts

Cutting planes are one of the main techniques currently used to solve large-scale MixedInteger Linear Programming (MIP) models. Many important cuts used in practice, such as Gomory Mixed-Integer (GMI) cuts, are obtained by solving the linear relaxation of the MIP, extracting a single row of the simplex tableau, then applying integrality arguments to it. A natural extension, which has received r...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Oper. Res. Lett.

دوره 41  شماره 

صفحات  -

تاریخ انتشار 2013