|Letter, L. A. Kaluzhnin->A.P. Ershov, 06.11.1957-09.11.1957
Invitation to Kiev for scientific consulting; request for some works by A.P. Ershov and papers on the problems of approximation errors
Letter, L. A. Kaluzhnin->A.P. Ershov, 24.11.1957-27.11.1957
Thanks for the received works by A.P. Ershov, microfilm and bibliography on the problems of approximation errors. Hopes for near meeting.
A form for A.P. Ershov to fill in connection with the preparation of the collection "Mathematics in the USSR in the last 40 years"
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