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From Encyclopedia of Mathematics
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The same as a half-line (cf. Half-line (ray)).

References

  • [a1] H.S.M. Coxeter, "Introduction to geometry", Wiley (1969) pp. 178
How to Cite This Entry:
Ray. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Ray&oldid=34264
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