Shared thoughts on Ivan Soskov (1954-2013)
نویسنده
چکیده
Just after midnight on the first day of orthodox Easter, Ivan Soskov passed away as a result of an allergic shock to a bee sting. I was a witness to roughly half of Ivan’s 59 years and am slowly getting used to his absence while thinking about Ivan’s path in life and sense of purpose and mission. Once, when he was about thirty years old, had left behind the careless days of his youth, and had recently defended his doctoral dissertation, he had discussed the issue of a purpose in life with friends and wondered whether he would be able to live his life in a way that would earn him the naming of a street. In the spring of 2013, Ivan and I were talking about his roots and Ivan was in a talkative mood. He had just submitted his (unfortunately, last) paper and told me that he is resigning from thinking about maths. Both his maternal and his paternal families come from Southern Bulgaria. When I ask him whether they were war refugees, he answers: “No, they weren’t, they had always lived there, simply natives.” His maternal grandfather, Georgi Rafailov (cf. Figure 1), was a notary’s son from Nova Zagora. “It is interesting that my great-grandfather managed to support my grandfather as a student in Paris with a modest salary of a small town notary. Would that be possible today?”
منابع مشابه
A Note on ω-Jump Inversion of Degree Spectra of Structures
In this note we provide a negative solution to the ω-jump inversion problem for degree spectra of structures.
متن کاملUniform Operators
We present the definition and a normal form of a class of operators on sets of natural numbers which generalize the enumeration operators.
متن کاملA jump inversion theorem for the enumeration jump
We prove a jump inversion theorem for the enumeration jump and a minimal pair type theorem for the enumeration reducibilty. As an application some results of Selman, Case and Ash are obtained.
متن کاملRegular Enumerations
In the paper we introduce and study regular enumerations for arbitrary recursive ordinals. Several applications of the technique are presented.
متن کاملUniform regular enumerations
In the paper we introduce and study the uniform regular enumerations for arbitrary recursive ordinals. As an application of the technique we obtain a uniform generalization of a theorem of Ash and a characterization of a class of uniform operators on transfinite sequences of sets of natural numbers.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Computability
دوره 3 شماره
صفحات -
تاریخ انتشار 2014