The author requests the addressee to participate in the Third symposium on the semigroup theory and congratulates on the New Year.

The author is sorry for the delay in answering because of his business trip in Bulgaria and his medical examination at the Moscow hospital. He is ready to receive the addressee with his wife in Akademgorodok in August.

The author thanks for the important letter and forwards it for answering to Prof. I.V.Pottosin.

Communicating a contribution to the TCS of two Bulgarian colleagues; congratulations with the 50th volume of "Theoretical Computer Science" and with a new house; promise to write an extended letter in August

in reply to the letter of June 23 concerning the Working Group meeting; promise to pass the addressee's letter to I.V. Pottosin when the vacation season will be over

The author thanks for the thoughtful letter of June 15. He will think of the addressee's offer to become a member of the editorial board of a new journal. His participation in an international seminar in Pisa (September 24-29) can help him to take a decision.

It is private letter. The author informs of his illness, meditates on his life: "preparing for the worse, to hope for the better". He remembers the unforgottable trip around the US, tells his plans and current affairs.

The author apologizes for the long delay in answering, but he couldn't ascertain necessary information: is anybody engage in questions of a record of program texts to floppy disks. He promises to inform as soon as will find out the address. (Handwritten text)

In reply to the letter of August 7, the author briefly characterizes Prof. Manacher's work. (Handwritten text)

The request to send the book for translation to the Russian. (Handwritten text)

The author thanks for the kind agreement with occasional applying for some publications of interest. He proposes candidature Dr.R.Sethi for substitution of Dr.Aho. (Handwritten text)

The author thanks for the paper, promises to pass it to colleagues which are interested in and will establish direct scientific connections with the addressee. (Handwritten text)

The letter is written at the instance of A.Ershov by his daughter. She informs about his forthcoming return in Novosibirsk and the following immediate sending of the article for "The Computer Software". (Handwritten and typewritten texts.)

The author informs that Academician E.Velikhov has approved the invitations of D.Bjorner and N.D.Jones. Formal letters will follow. (Handwritten text.)

The author apologizes for the late answer and gives a necessary information on a possibility to visit Academgorodok.

The Pennsylvania State University informs that the International Conference on Parallel Processing will be held in August 15-19, 1988, in St. Charles, Illinois.

Request to cable the birthdate and passport number for preparation of the visit to Novosibirsk

Advice to buy an Intourist tour for the group as the easiest way to visit Akademgorodok (handwritten)

The author thanks for the letter and interesting materials. His colleagues will study the addressee's paper more thoroughly and will establish direct scientific connections with developers.

A.Ershov asks to give a consent to an invitation of two Chinese scientists for participation in International Work Meeting on "Expert Systems and Pattern Recognition". (in two addresses)