Discrete Mathematics ( IF 0.7 ) Pub Date : 2021-02-12 , DOI: 10.1016/j.disc.2021.112332 S. Eliahou , M.P. Revuelta
Let be an abelian group. A subset of is sumfree if it contains no elements such that . We extend this concept by introducing the Schur degree of a subset of , where Schur degree 1 corresponds to sumfree. The classical inequality , between the Schur number and the Ramsey number , is shown to remain valid in a wider context, involving the Schur degree of certain subsets of . Recursive upper bounds are known for but not for so far. We formulate a conjecture which, if true, would fill this gap. Indeed, our study of the Schur degree leads us to conjecture for all . If true, it would yield substantially better upper bounds on the Schur numbers, e.g. conjecturally, whereas all is known so far is .
中文翻译:
添加剂集的舒尔度
让 成为一个阿贝尔团体。的子集如果不包含任何元素,则为sumfree 这样 。我们通过引入以下子集的舒尔度来扩展这个概念,其中Schur度1对应于sumfree。古典不平等,在舒尔数之间 和拉姆齐数 被证明在更广泛的背景下仍然有效,涉及到某些子集的舒尔度 。递归上限是众所周知的 但不是 至今。我们提出一个猜想,如果成立,它将填补这一空白。确实,我们对舒尔学位的研究使我们产生了猜想 对所有人 。如果为true,则将在Schur数上产生更好的上限,例如 推测地说,到目前为止所有已知的是 。