Prirodovedecka fakulta Univerzity Palackeho, Trida Svobody 26, 771 46 Olomouc, Czech Republic
Abstract: In the paper the invariant (geometrical) character of some properties of natural planar ternary rings is shown by using isotopic transformations.
Keywords: planar ternary ring, natural planar ternary ring, isotopy of planar ternary rings
Classification (MSC91): 20N10, 51A25
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