Paavo Kukkurainen

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Let F be a family of subgroups of a group G = (G, ·) such that F = G. Then P = (F, ≤) is a partially ordered set (with an order dual to ⊆) and let a mapping A: G −→ P be a P-(fuzzy) subgroup of a group G defined by (6). The theory of fuzzy-subgroups is known [2] but in this paper we will apply it to the theory of Riemann surfaces. Mbius transformations form(More)
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