Automorphisms of normal partial transformation semigroups
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We let X be an arbitrary infinite set. A semigroup S of total or partial transformations of X is called -normal if hSh -1 = S , for all h in , the symmetric group on X . For example, the full transformation semigroup , the semigroup of all partial transformations , the semigroup of all 1–1 partial transformations and all ideals of and are -normal.
[1] Inessa Levi. AUTOMORPHISMS OF NORMAL TRANSFORMATION SEMIGROUPS , 1985 .
[2] J. Schreier,et al. Über Abbildungen einer abstrakten Menge auf ihre Teilmengen , 1937 .