| 释义 |
semi-ˈcubical, a. Math.
[semi- 7 b.]
Applied to the curve of the third degree with a cusp referred to rectangular axes, the equation to which can always be reduced to the form ay2 = x3.
The exponent of the power of the abscissa which is proportional to the ordinate is 3/2, whence the name.
1677Wallis in Rigaud Corr. Sci. Men (1841) II. 609 That [invention] of Mr. Neale is straightening the semi⁓cubical parabola without supposing the squaring an hyperbola. 1704J. Harris Lex. Techn. I, Semi-cubical Paraboloid, is a Curve whose Ordinates are in Subtriplicate of the Duplicate proportion of the Diameter. 1855G. Salmon Conic Sect. xiii. (ed. 3) §251 The equation of the evolute of a parabola represents a curve called the semicubical parabola. |