Two nonlinear lower bounds for on-line computations
نویسندگان
چکیده
منابع مشابه
Two Nonlinear Lower Bounds for On-Line Computations
One of the major goals of theoret ical computer science is proving nontrivial lower bounds on the (time or space) complexi ty of specific problems. Unfortunately, despite continued research effort for the last ten years, the success in proving lower bounds has been minimal. The only known general lower bounds are at least exponential [2, Chap. 1 1]. For no specific problem in NP can we prove a ...
متن کاملLower Bounds for On-line Graph Colorings
We propose three strategies for Presenter in on-line graph coloring games. The first one constructs bipartite graphs and forces any on-line coloring algorithm to use 2 log2 n − 10 colors, where n is the number of vertices in the constructed graph. This is best possible up to an additive constant. The second strategy constructs triangle-free graphs and forces Ω(n 1 2 ) colors. The third one cons...
متن کاملTreewidth computations II. Lower bounds
For several applications, it is important to be able to compute the treewidth of a given graph and to find tree decompositions of small width reasonably fast. Good lower bounds on the treewidth of a graph can, amongst others, help to speed up branch and bound algorithms that compute the treewidth of a graph exactly. A high lower bound for a specific graph instance can tell that a dynamic progra...
متن کاملCommunication Lower Bounds for Distributed-Memory Computations
In this paper we propose a new approach to the study of the communication requirements of distributed computations, which advocates for the removal of the restrictive assumptions under which earlier results were derived. We illustrate our approach by giving tight lower bounds on the communication complexity required to solve several computational problems in a distributedmemory parallel machine...
متن کاملTwo lower bounds on
The lower bounds on communication complexity measures of language generation by Parallel Communicating Grammar Systems (PCGS) are investigated. The rst result shows that there exists a language that can be generated by some dag-PCGS (PCGS with communication structures realizable by directed acyclic graphs) consisting of 3 grammars, but by no PCGS with tree communication structure. The second re...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Information and Control
سال: 1984
ISSN: 0019-9958
DOI: 10.1016/s0019-9958(84)80019-4