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Lacunary ideal convergence in intuitionistic fuzzy normed linear spaces. (English) Zbl 1238.40003
Summary: We introduce and study the notion of lacunary ideal convergence in intuitionistic fuzzy normed linear spaces as a variant of the notion of ideal convergence. Also, a new concept, called lacunary convergence, is introduced. Using these two notions, lacunary $$I$$-limit points and lacunary $$I$$-cluster points have been defined and the relation between them has been established. Characterization for lacunary ideal convergence preserving linear operators has been given. Furthermore, the notions of lacunary Cauchy and lacunary $$I$$-Cauchy sequences are introduced and studied.

##### MSC:
 40A35 Ideal and statistical convergence 46S40 Fuzzy functional analysis
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