1. Prove that Subsets OF o-ring 8(T) sit For any and за ск Prove Caass iF ring ор then there that any тск hereditary T = is a class Set X then same J O-ring k T +0 of heredi there T≤8(0) k sit iCK, Subsets to excist hereditary REJ Sit TCR (I) and 3. Prove that if I+O hereditary 5-ring Some Set is Some a hereditary set X ·editary ring K. s. t ROCK. is •CLASS OF exist 9 exist subsets of a X then there. hereditary O-ring Si+ ICH(D), TCK, X(t) cK тск, ск

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