created sense approved 平行公设/平行公設 · píngxínggōngshè · parallel postulate
平行公设 / 平行公設
píngxínggōngshè
parallel postulate
The fifth postulate of Euclidean geometry, which states that exactly one line can be drawn through a given point parallel to a given line.
许多数学家曾试图用其他公理来证明平行公设。