On the subgroups of the Picard group.
Ellipses and harmonic Möbius transformations.
On fixed figure problems in fuzzy metric spaces
Fixed circle problems belong to a realm of problems in metric fixed point theory. Specifically, it is a problem of finding self mappings which remain invariant at each point of the circle in the space. Recently this problem is well studied in various metric spaces. Our present work is in the domain of the extension of this line of research in the context of fuzzy metric spaces. For our purpose, we first define the notions of a fixed circle and of a fixed Cassini curve then determine suitable conditions...
On the principal congruence subgroups of the Hecke-group .
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