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We present optimal upper bounds for the deviation of a fuzzy continuous function from its fuzzy average over [a, b] ⊂ R, error is measured in the D-fuzzy metric. The established fuzzy Ostrowski type inequalities are sharp, in fact attained by simple fuzzy real number valued functions. These inequalities are given for fuzzy Hölder and fuzzy differentiable… (More)

- George A. Anastassiou
- Studies in Fuzziness and Soft Computing
- 2010

- George A. Anastassiou
- Mathematical and Computer Modelling
- 2010

Here we define a Caputo like discrete nabla fractional difference and we produce discrete nabla fractional Taylor formulae for the first time. We estimate their remaiders. Then we derive related discrete nabla fractional Opial, Ostrowski, Poincaré and Sobolev type inequalities .

We prove the basic fuzzy Korovkin theorem via a fuzzy Shisha– Mond inequality given here. This determines the degree of convergence with rates of a sequence of fuzzy positive linear operators to the fuzzy unit operator. The surprising fact is that only the real case Korovkin assumptions are enough for the validity of the fuzzy Korovkin theorem, along with a… (More)

- George A. Anastassiou
- Computers & Mathematics with Applications
- 2012

- George A. Anastassiou
- Neural Networks
- 2011

Here we study the multivariate quantitative constructive approximation of real and complex valued continuous multivariate functions on a box or RN, N∈N, by the multivariate quasi-interpolation sigmoidal neural network operators. The "right" operators for our goal are fully and precisely described. This approximation is derived by establishing… (More)

- George A. Anastassiou
- Computers & Mathematics with Applications
- 2011

- George A. Anastassiou
- Mathematical and Computer Modelling
- 2011

- George A. Anastassiou
- Appl. Math. Lett.
- 2007