Sets of Formulas Valid in Finite Structures
نویسندگان
چکیده
منابع مشابه
Valid formulas, games and network protocols
We describe a remarkable relation between a fundamental notion of mathematical logic – that is valid formula of predicate calculus – and the specification of network protocols. We explain here in detail several simple examples : the acknowledgement of one or two packets, and then of an arbitrary number. We show that, using this method, it is possible to specify the composition of protocols. We ...
متن کاملAppropriate Loading Techniques in Finite Element Analysis of Underground Structures
Stability of underground structures is assessed by comparing rock strength with induced stresses resulted from ground stresses. Rock mass surrounding the opening may fail either by fracture or excessive deformation caused. Accurate calculation of induced stresses is therefore fundamental in the stability analysis of an opening. Although numerical methods, particularly finite element method, are...
متن کاملProving Valid Quantified Boolean Formulas in HOL Light
This paper describes the integration of Squolem, Quantified Boolean Formulas (QBF) solver, with the interactive theorem prover HOL Light. Squolem generates certificates of validity which are based on witness functions. The certificates are checked in HOL Light by constructing proofs based on these certificates. The presented approach allows HOL Light users to prove larger valid QBF problems tha...
متن کاملMatched Formulas and Backdoor Sets
We demonstrate hardness results for the detection of small backdoor sets with respect to base classes Mr of CNF formulas with maximum deficiency ≤ r (M0 is the class of matched formulas). One of the results applies also to a wide range of base classes with added ‘empty clause detection’ as recently considered by Dilkina, Gomes, and Sabharwal. We obtain the hardness results in the framework of p...
متن کاملBoolean Formulas and Frequent Sets
We consider the problem of how one can estimate the support of Boolean queries given a collection of frequent itemsets. We describe an algorithm that truncates the inclusion-exclusion sum to include only the frequencies of known itemsets, give a bound for its performance on disjunctions of attributes that is smaller than the previously known bound, and show that this bound is in fact achievable...
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: Transactions of the American Mathematical Society
سال: 1973
ISSN: 0002-9947
DOI: 10.2307/1996611