单词	dual Hopf algebra
释义
随便看	property of tangent line of a sphere property of tangent of a circle property of tangent plane of a sphere property of trihedral angles property of two parallel planes property of two perpendicular planes property proposition proportion proportional allocation proportional hazards model proportional mean proportional segments proportional segments proportional segments in a right triangle proportion chart proportion cutting block search proportion loop proposition proposition proposition proposition about equalities propositional algebra propositional atomic formula propositional calculus propositional compound formula

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