Universal relational systems

Fuzzy Relational Matrix-Based Stability Analysis for First-Order Fuzzy Relational Dynamic Systems

In this paper, two sets of sufficient conditions are obtained to ensure the existence and stability of a unique equilibrium point of unforced first-order fuzzy relational dynamical systems by using two different approaches which are both based on the fuzzy relational matrix of the model.In the first approach, the equilibrium point of the system is one of the centers of the related membership fu...

Universal Queries for Relational Query Languages

Relational lattices: From databases to universal algebra

Relational lattices are obtained by interpreting lattice connectives as natural join and inner union between database relations. Our study of their equational theory reveals that the variety generated by relational lattices has not been discussed in the existing literature. Furthermore, we show that addition of just the header constant to the lattice signature leads to undecidability of the qua...

Assessment of research systems in universal health coverage-related organizations

    Background: Universal health coverage (UHC) is the desired goal of achieving universal access to health services without having to endure pain and financial difficulties. Multiple factors can help steer countries toward UHC. One of the most important factors is the production of valid quality evidence that can be achieved through research. The present study aimed at outlining...

SISO fuzzy relational inference systems based on fuzzy implications are universal approximators

In this work, we show that single input single output (SISO) fuzzy inference systems based on Fuzzy Relational Inference (FRI) with implicative interpretation of the rule base are universal approximators under suitable choice of operations for the other components of the fuzzy system. The presented proofs make no assumption on the form or representations of the considered fuzzy implications and...