#### Filter Results:

- Full text PDF available (22)

#### Publication Year

2008

2016

- This year (0)
- Last 5 years (18)
- Last 10 years (27)

#### Publication Type

#### Co-author

#### Journals and Conferences

#### Key Phrases

Learn More

- Sun Sook Jin, Yang-Hi Lee
- Adv. Fuzzy Systems
- 2011

- Sun Sook Jin, Yang-Hi Lee
- Int. J. Math. Mathematical Sciences
- 2011

A classical question in the theory of functional equations is “when is it true that a mapping, which approximately satisfies a functional equation, must be somehow close to an exact solution of the equation?” Such a problem, called a stability problem of the functional equation, was formulated by Ulam 1 in 1940. In the next year, Hyers 2 gave a partial… (More)

- Sun Sook Jin, Yang-Hi Lee
- 2014

and Applied Analysis 3 is Cauchy. If each Cauchy sequence is convergent, then the fuzzy norm is said to be complete, and the fuzzy normed space is called a fuzzy Banach space. Let X,N be a fuzzy normed space and Y,N ′ a fuzzy Banach space. For a given mapping f : X → Y , we use the abbreviation Df ( x, y ) : f ( 2x y ) f ( 2x − y 2f x − fx y − fx − y − 2f… (More)

- SunSook Jin, Yang-Hi Lee, +4 authors YANG-HI LEE
- 2012

A classical question in the theory of functional equations is “when is it true that a mapping, which approximately satisfies a functional equation, must be somehow close to an exact solution of the equation?”. Such a problem, called a stability problem of the functional equation, was formulated by S. M. Ulam [22] in 1940. In the next year, D. H. Hyers [6]… (More)

- Sun Sook Jin, Yang-Hi Lee
- 2011

Introduction A classical question in the theory of functional equations is “when is it true that a mapping, which approximately satisfies a functional equation, must be somehow close to an exact solution of the equation?”. Such a problem, called a stability problem of the functional equation, was formulated by Ulam [1] in 1940. In the next year, Hyers [2]… (More)

- Yang-Hi Lee, Soon-Mo Jung
- Adv. Fuzzy Systems
- 2012

- Sun Sook Jin, Yang-Hi Lee, Sun-Sook Jin
- 2013

In this paper, we investigate a fuzzy version of stability for the functional equation

- Sun Sook Jin, Yang-Hi Lee
- 2013

In this paper, we prove the stability in random normed spaces via fixed point method for the functional equation f ⎛⎝ n ∑ j=1 xj ⎞⎠ + (n − 2) n ∑ j=1 f(xj) − ∑ 1≤i<j≤n f(xi + xj) = 0. Mathematics Subject Classification: 39B82, 46S50, 46S40

- Sun Sook Jin, Yang-Hi Lee
- J. Applied Mathematics
- 2011

- Yang-Hi Lee, Soon-Mo Jung
- 2014

distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Abstract In this paper, we investigate the generalized Hyers-Ulam stability of a functional equation 1≤i,j≤n, i =j f (x i + x j) + f (x i − x j) = (n − 1) n i=1 3f (x i) + f… (More)