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On the form of functions which preserve regressive isols. (English) Zbl 0272.02067

##### MSC:
 03D50 Recursive equivalence types of sets and structures, isols 03D30 Other degrees and reducibilities in computability and recursion theory
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##### References:
 [1] J. Barback [1] Recursive functions and regressive isols , Math. Scand. 15 (1964), 29-42. · Zbl 0148.24701 · doi:10.7146/math.scand.a-10724 · eudml:165886 [2] J.C.E. Dekker [2] Infinite series of isols , Amer. Math. Soc. Proc. Symposia Pure Math. 5 (1962), 77-96. · Zbl 0171.27001 [3] J.C.E. Dekker [3] The minimum of two regressive isols , Math. Zeit. 83 (1964), 345-366. · Zbl 0122.01002 · doi:10.1007/BF01111167 · eudml:170234 [4] J.C.E. Dekker and J. Myhill [4] Retraceable sets , Canad. J. Math. 10 (1958), 357-373. · Zbl 0082.01505 · doi:10.4153/CJM-1958-035-x [5] E. Ellentuck [5] Universal cosimple isols, 42 (1972), 629-638 Pacif. J. Math. · Zbl 0254.02032 · doi:10.2140/pjm.1972.42.629 [6] M.J. Hassett [6] A closure property of regressive isols , Rocky Mt. J. Math. 2 (1972), 1-24. · Zbl 0238.02036 · doi:10.1216/RMJ-1972-2-1-1 [7] A. Nerode [7] Extensions of isols , Ann. of Math. 73 (1961), 362-403. · Zbl 0101.01203 · doi:10.2307/1970338
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