| ชื่อเรื่อง | : | Reduction of symmetric semidefinite programs using the regular representation. |
| นักวิจัย | : | Klerk, Etienne de. , Pasechnik, Dmitrii V. , Schrijver, Alexander. |
| คำค้น | : | DRNTU::Science::Mathematics. |
| หน่วยงาน | : | Nanyang Technological University, Singapore |
| ผู้ร่วมงาน | : | - |
| ปีพิมพ์ | : | 2549 |
| อ้างอิง | : | Klerk, E. d., Pasechnik, D. V. & Schrijver, A. (2006). Reduction of symmetric semidefinite programs using the regular representation. Mathematical Programming, 109, 613-624. , http://hdl.handle.net/10220/7625 , http://dx.doi.org/10.1007/s10107-006-0039-7 |
| ที่มา | : | - |
| ความเชี่ยวชาญ | : | - |
| ความสัมพันธ์ | : | Mathematical programming |
| ขอบเขตของเนื้อหา | : | - |
| บทคัดย่อ/คำอธิบาย | : | We consider semidefinite programming problems on which a permutation group is acting.We describe a general technique to reduce the size of such problems, exploiting the symmetry. The technique is based on a low-order matrix ∗-representation of the commutant (centralizer ring) of the matrix algebra generated by the permutation matrices.We apply it to extending amethod of de Klerk et al. that gives a semidefinite programming lower bound to the crossing number of complete bipartite graphs. It implies that cr(K8,n) ≥ 2.9299n2−6n, cr(K9,n) ≥ 3.8676n2 − 8n, and (for any m ≥ 9) lim n→∞ cr(Km,n)/Z(m, n) ≥ 0.8594 m/m − 1, where Z(m,n) is the Zarankiewicz number [1/4(m-1)2][1/4(n-1)2], which is the conjectured value of cr(K m,n ). Here the best factor previously known was 0.8303 instead of 0.8594. |
| บรรณานุกรม | : |
Klerk, Etienne de. , Pasechnik, Dmitrii V. , Schrijver, Alexander. . (2549). Reduction of symmetric semidefinite programs using the regular representation..
กรุงเทพมหานคร : Nanyang Technological University, Singapore. Klerk, Etienne de. , Pasechnik, Dmitrii V. , Schrijver, Alexander. . 2549. "Reduction of symmetric semidefinite programs using the regular representation.".
กรุงเทพมหานคร : Nanyang Technological University, Singapore. Klerk, Etienne de. , Pasechnik, Dmitrii V. , Schrijver, Alexander. . "Reduction of symmetric semidefinite programs using the regular representation.."
กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2549. Print. Klerk, Etienne de. , Pasechnik, Dmitrii V. , Schrijver, Alexander. . Reduction of symmetric semidefinite programs using the regular representation.. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2549.
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