On Graph Refutation for Relational Inclusions
نویسندگان
چکیده
منابع مشابه
On Graph Refutation for Relational Inclusions
We introduce a sound and complete goal-oriented graph calculus for relational inclusions.1 Though somewhat richer, it is conceptually simpler and easier to use than the usual ones, as is its extension for handling hypotheses, due to goal-orientation. Diagrams and figures are very important and useful in several branches of science, as well as in everyday life. Graphs and diagrams provide conven...
متن کاملParallel Algorithms for Refutation Tree Problem on Formal Graph Systems
We define a new framework for rewriting graphs, called a formal graph system (FGS), which is a logic program having hypergraphs instead of terms in first-order logic. We first prove that a class of graphs is generated by a hyperedge replacement grammar if and only if it is defined by an FGS of a special form called a regular FGS. In the same way as logic programs, we can define a refutation tre...
متن کاملGraph Analytics on Relational Databases
Graph analytics has become increasing popular in the recent years. Conventionally, data is stored in relational databases that have been refined over decades, resulting in highly optimized data processing engines. However, the awkwardness of expressing iterative queries in SQL makes the relational queryprocessing model inadequate for graph analytics, leading to many alternative solutions. Our r...
متن کاملGraph Analytics on Relational Databases
Graph analytics is getting increasingly popular these days and there is a deluge of new systems for graph analytics. However, it is not clear how good or bad are the relational databases for graph analytics. In this talk, I will share our experiences with graph analytics on relational databases. Contrary to the popular belief, modern relational databases can have very good performance over grap...
متن کاملOn Learning versus Refutation
Building on the work of Daniely et al. (STOC 2014, COLT 2016), we study the connection between computationally efficient PAC learning and refutation of constraint satisfaction problems. Specifically, we prove that for every concept class P, PAC-learning P is polynomially equivalent to “random-right-hand-side-refuting” (“RRHS-refuting”) a dual class P∗, where RRHS-refutation of a class Q refers ...
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: Electronic Proceedings in Theoretical Computer Science
سال: 2012
ISSN: 2075-2180
DOI: 10.4204/eptcs.81.4