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On a result of Birkhoff |
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| Authors: | G Grätzer H Lakser E T Schmidt |
| Institution: | (1) Department of Mathematics, University of Manitoba, R3T 2N2 Winnipeg, Man, Canada;(2) Department of Mathematics Transport Engineering Faculty, Technical University of Budapest, M egyetem RKP. 9, 1111 Budapest, Hungary |
| Abstract: | The research of the first two authors was supported by the NSERC of Canada. |
| Keywords: | Primary 06D05 Secondary 08A35 |
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