to reprints sent on the addressee's reguest.

to letterheads.

about a change of a mailing address from 22 August 1985.

The author informs of his new address.

Information for WG2.5 participants of IFIP Working conference.

on the occasion of the addressee's article on the algorithmic notation in journal "Kvant" /Quantum/ (№ 9, 1985).

The author invites the addressee as lector to take part in National school on programming for young scientists. The school will be held in Primorsko on the Black sea at 14-24.05.1986.

Organizing Committee of School on algebra and logic (23.09 - 03.10.1986, resort "Drujba" near Varna) officialy invites the addressee to be a lector. Accomodation and living expenses will be payed by organizers.

The author sends the abstract of the doctoral dissertation by D.Skordev and asks the addressee to write his opinion about scientific qualities of this work.

The author tells about works on school informatics in his institute and wishes to send one post-graduate and two students to summer school of young programmers.

The Sector of Mathematical Logic (Sofia, Bulgaria) plans to organize the International Summer School and Conference "Mathematical Logic and its Applications". The Organizing Committee invites the addressee as a lector for the School and as a member of the Programme Committee for the Conference.

Returned from USA and two trips in Central Europe the author found the addressee's letter of April 29 with the bad news about his health. The author and his wife hope and wish the addressee the quick recovery.

The author asks the addressee to give the written reveiw of the author's doctoral dissertation abstract. He hopes that the addressee's health was completely recovered.

The author informs of a new publication on Logic by Zohar Manna and Richard Waldinger because of the addressee is working in the same field and is a colleague of the authors. An inspection copy questionnaire is attached.

The author has received a letter that is a part of a chain started in Japan. Its purpose is to allow scientists to express their support for the end of the arms race and a start of the nuclear disarmament. The author asks the addressee to write the similar letter to ten further scientists and to send a copy of the letter to Japanese Professor T.Ito. /On the reverse side A.Ershov wrote last names of ten scholars to whom he intended to write such letter./

The author has received a letter that is a part of a chain started in Japan. Its purpose is to allow scientists to express their support for the end of the arms race and a start of the nuclear disarmament. The author asks the addressee to write the similar letter to ten further scientists and to send a copy of the letter to Japanese Professor T.Ito.

The author sends his book "Introduction to Programming" in appreciation to the addressee for his outstanding contribution to science. Furthermore he is acquainted with addressee./Handwritten text./

The addressee once again is invited to the International Summer School and Conference "Mathematical Logic and its Applications" as a lector for the School and as a member of the Programme Committee for the Conference. The author asks to give an answer as soon as possible.

The author informs that they plan to start a pilot project of introducing microcomputers in high school. He asks the addressee to send materials (possibly in Russian) on the use of micros in the secondary school. The addressee's advise and opinion will be also appreciated.

The author informs about a current state of preparation of symposium MFCS'86 (Bratislava, August, 25-29) and inquires about the addressee's participation in the Selection Meeting (Bratislava, March, 26-27) and MFSC'86 Meeting.