By Chong C.T., et al. (eds.)

The Wolf Prize, provided by way of the Wolf starting place in Israel, usually is going to mathematicians who're of their sixties or older. that's to claim, the Prize honours the achievements of an entire life. T This worthy paintings positive aspects bibliographies, very important papers, and speeches (for instance at foreign congresses) of Wolf Prize winners, s uch as R. Bott, A.P. Calderon, A.N. Kolmogorov, M.G. Krein, P. Lax, H. Lewy, L. Lovasz, J. Milnor, J. Moser, I. Piatetski-Shapiro, J.P. Serre, C.L. Siegel, Y. Sinai, E.M. Stein, J. knockers, A. Weil, H. Whitney, A. Wiles and O. Zariski. this can be the 1st time that records on Wolf Prize winners were released jointly. because the paintings of the Wolf laureates covers a large spectrum, a lot of the math of the twentieth century involves lifestyles during this publication Seminormal effective measures on Pk(lambda), Y. Abe; recursion concept and susceptible fragments of Peano mathematics - a examine of definable cuts, C.T. Chong and Y. Yang; lattice embedding into d-r.e. levels protecting zero and 1, D. Ding and L. Qian; on desk bound mirrored image rules, Q. Feng; decidability and undecidability within the enumerable Turing levels, S. Lempp; a word on susceptible segments of PFA, T. Miyamoto; linear set conception with strict comprehension, M. Shirahata; an answer to an issue of Marek and Truszcy ski, okay. Su and H. Chen; DNK and usual reasoning, M. Yasugi and M. Nakata; Asian common sense meetings, M. Yasugi; different papers

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E. set D so that B = A © D has the desired properties, namely D < T A, and B does not support C. We ensure the condition D < T A by a permitting argument. To satisfy the last property we meet the following requirements for all e, Se : $ e total & (M, —► $ e is not an extension of Z/, where { $ e } e G a ; is an enumeration of all partial- recursive functions. For each e G w w e set aside the set of numbers Re = {2(e, x) + 1 : x 6 CJ} from which to draw witnesses to satisfy Se.

The reader will notice that many of these had originated in ordinal recursion theory developed since the early 1960's. The fact that there is a tight link between recursion theory on ordinals and that on weak fragments of P is a fortuitous coinci­ dence probably not anticipated by the founders of these two subjects. We believe that there is a two-way interaction between them, and expect to see 48 C H O N G AND Y A N G more applications going in either direction. We begin with some definitions and terminologies.

P. e. comeager. Proof. It suffices to define an effective system of partial extension functions / such that for every set A £ BI(C) there is an index e such that fe is dense along A and fe(A\n) % A whenever fe(A\n) is defined. Given a recursive set U such that C = {Ue : e > 0} such a system / is obtained by letting f2e+i(x) — x~i if \x\ £ Ue and / 2 e + i ( x ) | otherwise (e > 0, i < 1). e. nowhere dense via / 2 e or / 2 e + i , respectively. e. meager but not effectively meager. e. meager but not effectively meager.

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