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EnglishEdit

EtymologyEdit

co- +‎ plane

NounEdit

coplane (plural coplanes)

  1. (mathematics) The dual of a plane.
    • 1980, Jaya Srivastava, Combinatorial Mathematics, Optimal Designs, and Their Applications, page 61:
      In Section 4 we show that any PMD in which a coplane is not the intersection of two hyperplanes is an extension of a projective plane.