Description of posets critical with respect to the nonnegativity of the quadratic Tits form

• Дата: 2009
• Автори: Bondarenko, V. M., Stepochkina, M. V., Бондаренко, В. М., Степочкина, М. В.
• Формат: Стаття
• Мова: Російська; Англійська
• Опубліковано: Institute of Mathematics, NAS of Ukraine 2009
• Онлайн доступ: https://umj.imath.kiev.ua/index.php/umj/article/view/3045
• Назва журналу: Ukrains’kyi Matematychnyi Zhurnal

We present the complete description of finite posets whose Tits form is not nonnegative but all proper subsets of which have nonnegative Tits forms. A similar result for positive forms was obtained by the authors earlier.