Let R be a subset of a unital ring Q such that 0 is an element of R. Let us fix an element t is an element of Q. If R is a (t; d)-free subset of Q, then T-n(R) is a (t'; d)-free subset of T-n(Q), where t' is an element of T-n(Q), t'(ll) = t, l = 1, 2, ..., n, for any n is an element of N.
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Univ Orange Free State, Dept Math & Appl Math, ZA-9300 Bloemfontein, South AfricaUniv Orange Free State, Dept Math & Appl Math, ZA-9300 Bloemfontein, South Africa
Meyer, Johan
Szigeti, Jeno
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Univ Miskolc, Inst Math, H-3515 Miskolc, HungaryUniv Orange Free State, Dept Math & Appl Math, ZA-9300 Bloemfontein, South Africa
Szigeti, Jeno
van Wyk, Leon
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Univ Stellenbosch, Dept Math Sci, ZA-7602 Stellenbosch, South AfricaUniv Orange Free State, Dept Math & Appl Math, ZA-9300 Bloemfontein, South Africa