TIKHONOV 394 



Office: USSR Academy of Sciences 



Leninskii Prospekt, 14 



Moscow, USSR 

 Residence: 1-aya Cheremushkinskaya, 3 



Moscow, USSR 

 Telephone: B7 34 56 



TIKHONOV, ANDREI NIKQLAEVICH (Mathematician and 

 Geophysicist) 



A. N. Tikhonov was born October 30, 1906 in Gzhatsk, 

 Smolensk Oblast. He graduated in 1927 from Moscow Universi- 

 ty. He holds the Doctor of Physical- Mathematical Sciences de- 

 gree and in 1936 became a professor at Moscow University. He 

 is also at the Institute of Terrestrial Physics. In 1939 he was 

 elected a Corresponding Member of the U.S.S.R. Academy of 

 Sciences. 



The first investigations of Tikhonov were in theoretical 

 topology. He introduced the concept of the product of topologi- 

 cal spaces ("Tikhonov Product"). He then worked in mathe- 

 matical physics and geophysics such as on theorems of unique- 

 ness for equations of the parabolic type, distribution of electro- 

 magnetic fields, investigation of commercial minerals, and 

 electromagnetic sounding of deep layers of the earth's crust 

 with the aid of variation of the electromagnetic field of the 

 earth. 

 Bibliography: 



On determining the electric characteristics of deep layers 



of the earth's crust. Doklady Akad. Nauk S.S.S.R., 1950, 73, 



#2. 



On the singleness of solving the problems of electrosurvey- 



ing. Doklady Akad. Nauk S.S.S.R., 1949, 69, #6. 



and A. A. Samarskii. Equations in Mathematical Physics. 



2nd Ed. Moscow: 1953. 

 Office: Moscow University 



Moscow, USSR 

 Residence: Leninskii Prospekt, 13 



Moscow, USSR 

 Telephone: B2 46 95 



TIMOFEEV, PYOTR VASIL'EVICH (Electrical Engineer) 



P. V. Timofeev was born June 25, 1902. In 1925 he gradu- 

 ated from Moscow University. In 1928 he began working at the 

 AU-Union Electro-Technical Institute. He has taught at Moscow 

 University, the Moscow Institute of Energetics and other 



