منابع مشابه
Inverting Implication
All generalisations within logic involve inverting implication. Yet, ever since Plotkin's work in the early 1970's methods of generalising rst-order clauses have involved inverting the clausal subsumption relationship. However , even Plotkin realised that this approach was incomplete. Since inversion of subsumption is central to many Inductive Logic Programming approaches, this form of incomple...
متن کاملOn Inverting Onto Functions
We study the complexity of inverting many-one, honest, polynomial-time computable onto functions. Asserting that every polynomial-time computable, honest, onto function is invertible is equivalent to the following proposition that we call Q: For all NP machines M that accept , there exists a polynomial-time computable function gM such that for all x, gM(x) outputs an accepting computation of M ...
متن کاملInverting the Furstenberg correspondence
Given a sequence of sets An ⊆ {0, . . . , n − 1}, the Furstenberg correspondence principle provides a shift-invariant measure on 2 that encodes combinatorial information about infinitely many of the An’s. Here it is shown that this process can be inverted, so that for any such measure, ergodic or not, there are finite sets whose combinatorial properties approximate it arbitarily well. The finit...
متن کاملInverting Functions as Folds
This paper is devoted to the proof and applications of a theorem giving conditions under which the inverse of a partial function can be expressed as a relational hylomorphism. The theorem is a generalisation of a previous result, due to Bird and de Moor, that gave conditions under which a total function can be expressed a relational fold. The theorem is illustrated with three problems, all deal...
متن کاملInverting the organisational pyramid
In any healthcare institution, the most important people are patients and their families [1]. These people benefit from the services of the institution, pay for these services either directly or indirectly through third-party payers, and hence affect the marketing of the institution through expressions of satisfaction (or dissatisfaction) with the services. They also form a customer base for 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: Nature Reviews Chemistry
سال: 2020
ISSN: 2397-3358
DOI: 10.1038/s41570-020-0194-z