\(\mathcal{H-}\),\(\mathcal{R-}\)and \(\mathcal{L-}\)cross-sections of the infinite symmetric inverse semigroup \(IS_X\) von Pyekhtyeryev, Vasyl

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\(\mathcal{H}\)- and \(\mathcal{R}\)-cross-sections of the full finite semigroup \(T_n\) von Pyekhtyeryev, Vasyl

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