On the Problem of Definability of Collinearity in Terms of the Midpoint Relation 1)1)The results of this paper were obtained and prepared for publication while the author was working at the University of California, Berkeley, on a research project in the foundations of mathematics, sponsored by the U.S. National Science Foundation under Grants No. GP-1395 and GP-4608.
1967 ◽
Vol 70
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pp. 183-187
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2001 ◽
Vol 40
(19)
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pp. 3596
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1985 ◽
pp. 211-218
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1976 ◽
pp. 267-292
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2002 ◽
Vol 41
(13)
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pp. 2405
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