taken during the talks with american scientists

apologies for the delay in sending the promised paper; information that the survey on the theory of parallel programming is almost ready

notification of not being able to prepare the article in time

apologies for not being able to write a promised article on automated programming owing to pressure of work and long illness

informing about not being able to write the promised article because of being busy with preparation of a talk on the theory of program schemata for IFIP Congress; proposal to prepare a n article based on this talk

notification of accepting the kind invitation

information about the program of stay in the USA if it is limited by 2 weeks and about its possible prolongation for a week since additional invitation have been received

thanks for the invitation and preliminary suggestions for the program of the visit to Philadelphia

thanks for the invitation and preliminary suggestions for the program of the visit to the USA

proposals for preparing an article for the collection based on the talk at the IFIP-71 Congress

discussion of the problem of obtaining A.P. Ershov’s biography