Covering letter for hotel reservation forms to be completed by the participants of the PC meeting. A form is attached.

informing on the term of the third PC meeting.

"Arriving Netherlands on Saturday (2nd of March) for ten days. Will be happy to pay visit."

"Arriving on Saturday (2nd of March)."

"The expenses for your 10 day stay in Amsterdam will be covered by IFIP. ... Let us know the time of your arrival and departure."

confirming the arrangements made for A.P.Ershov to chair Congress sessions.

of the Scientifical Council of the Computing Center (USSR Ac. Sci., Siberian Branch) concerning the report of A.P.Ershov on his trip to the Netherlands in March of 1980.

Covering letter for the Report of A.P.Ershov on his participation in the third PC meeting, and this Report itself.

of A.P.Ershov on his participation in the third PC meeting.

from the PC meeting.

confirming that A.P.Ershov has been beyond the country from 1.03.80 to 10.03.80.

on current affairs in Amsterdam and Moscow.

"May I telephone you (van Wingaarden) this Saturday from the hotel?"

1) A leaf of the LOT company (Polish aialines). 2) Boarding card of KLM aircompany for a flight from Amsterdam to Moscow. 3) A thicket for a bioscope presentation. 4) A card of the "Jan Luyken" Hotel. 5)A visiting card of the "Aeroflot" station manager in the airport Schiphol. 6) A thicket to the Filmtheater "Cupido". 7) 2 thickets of local transport.

1) Checks from the "P.W.Akkerman" and "Kent-Modes" shops (Amsterdam). 2) A note with a working address of an employee of the USSR Ac. Sci. Department of International Relations. 3) Telephones list of USSR offices in the Netherlands. 4) A visiting card of the "Aeroflot" general manager for Netherlands.

The representation of "Aeroflot" in Poland apologizes for an error it has commited.

on a standard sheet of the Mathematical Center.

1) Request for a reservation for a table in a dining room of the Sonesta Hotel. 2) Ralway itenary Zandvoort-Maastricht. 3) "Aeroflot" thicket for a flight Moscow-Amsterdam-Moscow (1-10.03.1980).

"I have scheduled your talk on March 5."

Ershov is ready to visit the Mathematical Centrum (Amsterdam) and give there an informal talk. The letter contains also the resume of this talk.